Height Extraction

Step by step guide

The following guide will help you understand Step-by-step how to work with the Map Colonies Height Extraction service, from the Catalog to the WCS protocol.

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This guide is not for viewing purposes.

note

Please note the obligations you need to follow while using our services.

warning

Any request to our services should include a token as a form of authentication.

Flow diagram

Query the DEM catalog (Step 1)

Query the DEM catalog service to find item(s) according to a desired filter examples are here.

Filter should be based on fields in the DEM profile.

All Records

When we want to get all of the records in the catalog we can make the following query:

curl --location --request POST '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--header 'Content-Type: application/xml' \
--data-raw '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="1" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
    </csw:Query>
</csw:GetRecords>'

Response

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<csw:GetRecordsResponse xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gml="http://www.opengis.net/gml" xmlns:ows="http://www.opengis.net/ows" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mc="http://schema.mapcolonies.com/dem" version="2.0.2" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd">
    <csw:SearchStatus timestamp="2026-02-11T14:05:23Z"/>
    <csw:SearchResults numberOfRecordsMatched="2" numberOfRecordsReturned="1" nextRecord="2" recordSchema="http://schema.mapcolonies.com/dem" elementSet="full">
        <mc:MCDEMRecord>
            <mc:acquisitionTimeBeginUTC>2019-12-31T11:00:00Z</mc:acquisitionTimeBeginUTC>
            <mc:acquisitionTimeEndUTC>2019-12-31T11:00:00Z</mc:acquisitionTimeEndUTC>
            <mc:areaOrPoint>Area</mc:areaOrPoint>
            <mc:classification>0</mc:classification>
            <mc:dataType>FLOAT32</mc:dataType>
            <mc:description></mc:description>
            <mc:footprint>{"type":"Polygon","coordinates":[[[0,0],[10,0],[10,10],[0,0]]]}</mc:footprint>
            <mc:geoidModel>egm96</mc:geoidModel>
            <mc:id>e2d812ba-40b7-4dfe-b3e7-869356467d3a</mc:id>
            <mc:ingestionDateUTC>2025-12-31T10:17:16Z</mc:ingestionDateUTC>
            <mc:insertDateUTC>2020-12-31T11:00:00Z</mc:insertDateUTC>
            <mc:links scheme="WCS" name="mimad-DSM" description=""><WCS_SERVICE_URL>/wcs?request=GetCapabilities</mc:links>
            <mc:links scheme="WCS_BASE" name="mimad-DSM" description=""><WCS_SERVICE_URL>/wcs</mc:links>
            <mc:links scheme="WFS_BASE" name="mimad-DSM" description=""><WFS_SERVICE_URL>/wfs?request=GetCapabilities</mc:links>
            <mc:links scheme="Download" name="mimad-DSM" description=""><DOWNLOAD_SERVICE_URL>/path/to/file.ext</mc:links>
            <mc:maxAbsoluteAccuracyLEP90>2</mc:maxAbsoluteAccuracyLEP90>
            <mc:maxHorizontalAccuracyCEP90>6</mc:maxHorizontalAccuracyCEP90>
            <mc:maxRelativeAccuracyLEP90>4</mc:maxRelativeAccuracyLEP90>
            <mc:maxResolutionDegree>0.0004</mc:maxResolutionDegree>
            <mc:maxResolutionMeter>40</mc:maxResolutionMeter>
            <mc:minAbsoluteAccuracyLEP90>1</mc:minAbsoluteAccuracyLEP90>
            <mc:minHorizontalAccuracyCEP90>5</mc:minHorizontalAccuracyCEP90>
            <mc:minRelativeAccuracyLEP90>3</mc:minRelativeAccuracyLEP90>
            <mc:minResolutionDegree>0.0004</mc:minResolutionDegree>
            <mc:minResolutionMeter>40</mc:minResolutionMeter>
            <mc:noDataValue>-32768</mc:noDataValue>
            <mc:producerName>PRODUCER</mc:producerName>
            <mc:productId>mimad</mc:productId>
            <mc:productName>mimad</mc:productName>
            <mc:productType>DSM</mc:productType>
            <mc:productVersion>1</mc:productVersion>
            <mc:region>region</mc:region>
            <mc:sensors>sensors</mc:sensors>
            <mc:srsId>4326</mc:srsId>
            <mc:srsName>WGS84GEO</mc:srsName>
            <mc:type>RECORD_DEM</mc:type>
            <mc:updateDateUTC>2020-12-31T11:00:00Z</mc:updateDateUTC>
            <ows:BoundingBox crs="urn:x-ogc:def:crs:EPSG:6.11:4326" dimensions="2">
                <ows:LowerCorner>0.0 0.0</ows:LowerCorner>
                <ows:UpperCorner>10.0 10.0</ows:UpperCorner>
            </ows:BoundingBox>
        </mc:MCDEMRecord>
    </csw:SearchResults>
</csw:GetRecordsResponse>

Specific Layer

To fetch a specific layer you need the following values:

1. productId
2. productType

Usually you make this kind of request when you know there's a specific product that you want.

When you have these values in hand you can make a POST request to <RASTER-CATALOG-SERVICE_URL>/csw with the following body (replace productId and productType with real values):

curl --location --request POST '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--header 'Content-Type: application/xml' \
--data-raw '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="1" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
        <csw:Constraint version="1.1.0">
            <Filter xmlns="http://www.opengis.net/ogc">
                <And>
                    <PropertyIsEqualTo>
                        <PropertyName>mc:productId</PropertyName>
                        <Literal>mimad</Literal>
                    </PropertyIsEqualTo>
                    <PropertyIsEqualTo>
                        <PropertyName>mc:productType</PropertyName>
                        <Literal>DSM</Literal>
                    </PropertyIsEqualTo>
                </And>
            </Filter>
        </csw:Constraint >
    </csw:Query>
</csw:GetRecords>'

Response

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<csw:GetRecordsResponse xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gml="http://www.opengis.net/gml" xmlns:ows="http://www.opengis.net/ows" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mc="http://schema.mapcolonies.com/dem" version="2.0.2" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd">
    <csw:SearchStatus timestamp="2026-02-15T13:53:32Z"/>
    <csw:SearchResults numberOfRecordsMatched="1" numberOfRecordsReturned="1" nextRecord="0" recordSchema="http://schema.mapcolonies.com/dem" elementSet="full">
        <mc:MCDEMRecord>
            <mc:acquisitionTimeBeginUTC>2019-12-31T11:00:00Z</mc:acquisitionTimeBeginUTC>
            <mc:acquisitionTimeEndUTC>2019-12-31T11:00:00Z</mc:acquisitionTimeEndUTC>
            <mc:areaOrPoint>Area</mc:areaOrPoint>
            <mc:classification>0</mc:classification>
            <mc:dataType>FLOAT32</mc:dataType>
            <mc:description></mc:description>
            <mc:footprint>{"type":"Polygon","coordinates":[[[0,0],[10,0],[10,10],[0,0]]]}</mc:footprint>
            <mc:geoidModel>egm96</mc:geoidModel>
            <mc:id>e2d812ba-40b7-4dfe-b3e7-869356467d3a</mc:id>
            <mc:ingestionDateUTC>2025-12-31T10:17:16Z</mc:ingestionDateUTC>
            <mc:insertDateUTC>2020-12-31T11:00:00Z</mc:insertDateUTC>
            <mc:links scheme="WCS" name="mimad-DSM" description=""><WCS_SERVICE_URL>/wcs?request=GetCapabilities</mc:links>
            <mc:links scheme="WCS_BASE" name="mimad-DSM" description=""><WCS_SERVICE_URL>/wcs</mc:links>
            <mc:links scheme="WFS_BASE" name="mimad-DSM" description=""><WFS_SERVICE_URL>/wfs?request=GetCapabilities</mc:links>
            <mc:links scheme="Download" name="mimad-DSM" description=""><DOWNLOAD_SERVICE_URL>/path/to/file.ext</mc:links>
            <mc:maxAbsoluteAccuracyLEP90>2</mc:maxAbsoluteAccuracyLEP90>
            <mc:maxHorizontalAccuracyCEP90>6</mc:maxHorizontalAccuracyCEP90>
            <mc:maxRelativeAccuracyLEP90>4</mc:maxRelativeAccuracyLEP90>
            <mc:maxResolutionDegree>0.0004</mc:maxResolutionDegree>
            <mc:maxResolutionMeter>40</mc:maxResolutionMeter>
            <mc:minAbsoluteAccuracyLEP90>1</mc:minAbsoluteAccuracyLEP90>
            <mc:minHorizontalAccuracyCEP90>5</mc:minHorizontalAccuracyCEP90>
            <mc:minRelativeAccuracyLEP90>3</mc:minRelativeAccuracyLEP90>
            <mc:minResolutionDegree>0.0004</mc:minResolutionDegree>
            <mc:minResolutionMeter>40</mc:minResolutionMeter>
            <mc:noDataValue>-32768</mc:noDataValue>
            <mc:producerName>PRODUCER</mc:producerName>
            <mc:productId>mimad</mc:productId>
            <mc:productName>mimad</mc:productName>
            <mc:productType>DSM</mc:productType>
            <mc:productVersion>1</mc:productVersion>
            <mc:region>region</mc:region>
            <mc:sensors>sensors</mc:sensors>
            <mc:srsId>srs_id</mc:srsId>
            <mc:srsName>WGS84GEO</mc:srsName>
            <mc:type>RECORD_DEM</mc:type>
            <mc:updateDateUTC>2020-12-31T11:00:00Z</mc:updateDateUTC>
            <ows:BoundingBox crs="urn:x-ogc:def:crs:EPSG:6.11:4326" dimensions="2">
                <ows:LowerCorner>0.0 0.0</ows:LowerCorner>
                <ows:UpperCorner>10.0 10.0</ows:UpperCorner>
            </ows:BoundingBox>
        </mc:MCDEMRecord>
    </csw:SearchResults>
</csw:GetRecordsResponse>

Product Type

Fetch all products with productType DTM.

curl --location --request POST '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--header 'Content-Type: application/xml' \
--data-raw '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="1" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
        <csw:Constraint version="1.1.0">
            <Filter xmlns="http://www.opengis.net/ogc">
                <PropertyIsEqualTo>
                    <PropertyName>mc:productType</PropertyName>
                    <Literal>DTM</Literal>
                </PropertyIsEqualTo>
            </Filter>
        </csw:Constraint >
    </csw:Query>
</csw:GetRecords>'

Response

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<csw:GetRecordsResponse xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gml="http://www.opengis.net/gml" xmlns:ows="http://www.opengis.net/ows" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mc="http://schema.mapcolonies.com/dem" version="2.0.2" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd">
    <csw:SearchStatus timestamp="2026-02-11T14:03:18Z"/>
    <csw:SearchResults numberOfRecordsMatched="1" numberOfRecordsReturned="1" nextRecord="0" recordSchema="http://schema.mapcolonies.com/dem" elementSet="full">
        <mc:MCDEMRecord>
            <mc:acquisitionTimeBeginUTC>2024-12-31T11:00:00Z</mc:acquisitionTimeBeginUTC>
            <mc:acquisitionTimeEndUTC>2024-12-31T11:00:00Z</mc:acquisitionTimeEndUTC>
            <mc:areaOrPoint>Area</mc:areaOrPoint>
            <mc:classification>0</mc:classification>
            <mc:dataType>FLOAT32</mc:dataType>
            <mc:footprint>{"type":"Polygon","coordinates":[[[0,0],[10,0],[10,10],[0,0]]]}</mc:footprint>
            <mc:geoidModel>egm96</mc:geoidModel>
            <mc:id>d2d812ba-40b7-4dfe-b3e7-869356467d3a</mc:id>
            <mc:ingestionDateUTC>2025-12-31T09:55:51Z</mc:ingestionDateUTC>
            <mc:insertDateUTC>2025-12-31T11:00:00Z</mc:insertDateUTC>
            <mc:links scheme="WCS" name="srtm30-DSM" description=""><WCS_SERVICE_URL>/wcs?request=GetCapabilities</mc:links>
            <mc:links scheme="WCS_BASE" name="srtm30-DSM" description=""><WCS_SERVICE_URL>/wcs</mc:links>
            <mc:links scheme="WFS_BASE" name="srtm30-DSM" description=""><WFS_SERVICE_URL>/wfs?request=GetCapabilities</mc:links>
            <mc:links scheme="Download" name="srtm30-DSM" description=""><DOWNLOAD_SERVICE_URL>/path/to/file.ext</mc:links>
            <mc:maxAbsoluteAccuracyLEP90>2</mc:maxAbsoluteAccuracyLEP90>
            <mc:maxHorizontalAccuracyCEP90>6</mc:maxHorizontalAccuracyCEP90>
            <mc:maxRelativeAccuracyLEP90>4</mc:maxRelativeAccuracyLEP90>
            <mc:maxResolutionDegree>0.0004</mc:maxResolutionDegree>
            <mc:maxResolutionMeter>40</mc:maxResolutionMeter>
            <mc:minAbsoluteAccuracyLEP90>1</mc:minAbsoluteAccuracyLEP90>
            <mc:minHorizontalAccuracyCEP90>5</mc:minHorizontalAccuracyCEP90>
            <mc:minRelativeAccuracyLEP90>3</mc:minRelativeAccuracyLEP90>
            <mc:minResolutionDegree>0.0004</mc:minResolutionDegree>
            <mc:minResolutionMeter>40</mc:minResolutionMeter>
            <mc:noDataValue>-32768</mc:noDataValue>
            <mc:producerName>PRODUCER</mc:producerName>
            <mc:productId>srtm30</mc:productId>
            <mc:productName>srtm30</mc:productName>
            <mc:productType>DTM</mc:productType>
            <mc:productVersion>1</mc:productVersion>
            <mc:region>region</mc:region>
            <mc:sensors>sensors</mc:sensors>
            <mc:srsId>4326</mc:srsId>
            <mc:srsName>WGS84GEO</mc:srsName>
            <mc:type>RECORD_DEM</mc:type>
            <mc:updateDateUTC>2025-12-31T11:00:00Z</mc:updateDateUTC>
            <ows:BoundingBox crs="urn:x-ogc:def:crs:EPSG:6.11:4326" dimensions="2">
                <ows:LowerCorner>0.0 0.0</ows:LowerCorner>
                <ows:UpperCorner>10.0 10.0</ows:UpperCorner>
            </ows:BoundingBox>
        </mc:MCDEMRecord>
    </csw:SearchResults>
</csw:GetRecordsResponse>

BBOX

Fetch all products with productType DTM and contained in a given BBOX.

curl --location --request POST '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--data-raw '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="1" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
        <csw:Constraint version="1.1.0">
            <Filter xmlns="http://www.opengis.net/ogc">
                <And>
                    <PropertyIsEqualTo>
                        <PropertyName>mc:productType</PropertyName>
                        <Literal>DTM</Literal>
                    </PropertyIsEqualTo>
                    <ogc:BBOX>
                        <ogc:PropertyName>ows:BoundingBox</ogc:PropertyName>
                        <gml:Envelope>
                            <gml:lowerCorner>-10 -10</gml:lowerCorner>
                            <gml:upperCorner>20 20</gml:upperCorner>
                        </gml:Envelope>
                    </ogc:BBOX>
                </And>
            </Filter>
        </csw:Constraint>
    </csw:Query>
</csw:GetRecords>'

Polygon

Fetch all products with productType DTM and intersect with a given Polygon.

info

We can provide a polygon with as many points as we want as long as the first and last are the same point.

curl --location --request POST '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--data-raw '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="1" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
        <csw:Constraint version="1.1.0">
            <Filter xmlns="http://www.opengis.net/ogc">
                <And>
                    <PropertyIsEqualTo>
                        <PropertyName>mc:productType</PropertyName>
                        <Literal>DTM</Literal>
                    </PropertyIsEqualTo>
                    <ogc:Intersects>
                        <ogc:PropertyName>ows:BoundingBox</ogc:PropertyName>
                        <gml:Polygon srsName="<SRS_IDENTIFIER>">
                            <gml:outerBoundaryIs>
                                <gml:LinearRing>
                                    <gml:coordinates decimal="." cs="," ts=" ">
                                        [COORD1_X],[COORD1_Y] [COORD2_X],[COORD2_Y] [COORD3_X],[COORD3_Y] [COORD4_X],[COORD4_Y] ... [COORDN_X],[COORDN_Y] [COORD1_X],[COORD1_Y]
                                    </gml:coordinates>
                                </gml:LinearRing>
                            </gml:outerBoundaryIs>
                        </gml:Polygon>
                    </ogc:Intersects>
                </And>
            </Filter>
        </csw:Constraint>
    </csw:Query>
</csw:GetRecords>'

Point

Fetch all products with productType DTM that intersect with a given Point.

curl --location '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--data '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="1" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
        <csw:Constraint version="1.1.0">
            <Filter xmlns="http://www.opengis.net/ogc">
                <And>
                    <PropertyIsEqualTo>
                        <PropertyName>mc:productType</PropertyName>
                        <Literal>DTM</Literal>
                    </PropertyIsEqualTo>
                    <ogc:Intersects>
                        <ogc:PropertyName>ows:BoundingBox</ogc:PropertyName>
                        <gml:Point srsName="EPSG:4326">
                            <gml:pos>5 5</gml:pos>
                        </gml:Point>
                    </ogc:Intersects>
                </And>
            </Filter>
        </csw:Constraint>
    </csw:Query>
</csw:GetRecords>'

Notice the attributes startPosition and maxRecords, both of them help us to implement the pagination concept. In result, we get the following attributes in the response:

• numberOfRecordsMatched indicating the total amount of records in the catalog matching our filters
• numberOfRecordsReturned indicating the amount of records returned for this request (may be less than maxRecords given in the request)
• nextRecord the value that should be passed for startPosition in the following request

In case we are fetching the full profile without any filters our next request should look like this:

curl --location --request POST '<DEM_CATALOG_SERVICE_URL>/csw?token=<token>' \
--header 'Content-Type: application/xml' \
--data-raw '<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords outputFormat="application/xml" outputSchema="http://schema.mapcolonies.com/dem" resultType="results" service="CSW" version="2.0.2" startPosition="2" maxRecords="1" xmlns:mc="http://schema.mapcolonies.com/dem" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc">
    <csw:Query typeNames="mc:MCDEMRecord">
        <csw:ElementSetName>full</csw:ElementSetName>
    </csw:Query>
</csw:GetRecords>'

Get metadata (Step 2)

In the Response, look for desired data according to profile definition.

For the next steps you may want to examine the information returned from the catalog and extraction service additional requests in order to make calculated decisions about which product to use.

Catalog service

info

For details about each field read more here.

Fields you may want to filter by:

Field name / Partial name	Filter purpose
footprint	Specific geographical area
...Accuracy...
...Resolution...	Mix and Max resolution
productType	Specific product type (for example: only DTM)
srsId / srsName	Wanted SRS
ingestionDateUTC	Layers that were ingested before / after a given time
updateDateUTC	Layers that were updated before / after a given time

Extraction service capabilities

info

Read more about this request here.

<WCS_SERVICE_URL>/wcs?request=GetCapabilities&token=<token>

Response

<?xml version="1.0" encoding="UTF-8"?>
<wcs:Capabilities xmlns:wcs="http://www.opengis.net/wcs/2.0" xmlns:ows="http://www.opengis.net/ows/2.0" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:gmlcov="http://www.opengis.net/gmlcov/1.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0.1" updateSequence="16" xmlns:int="https://www.opengis.net/wcs/interpolation/1.0" xmlns:crs="http://www.opengis.net/wcs/crs/1.0" xmlns:inspire_common="http://inspire.ec.europa.eu/schemas/common/1.0" xmlns:inspire_dls="http://inspire.ec.europa.eu/schemas/inspire_dls/1.0" xsi:schemaLocation=" http://www.opengis.net/wcs/2.0 http://schemas.opengis.net/wcs/2.0/wcsGetCapabilities.xsd http://inspire.ec.europa.eu/schemas/inspire_dls/1.0 https://inspire.ec.europa.eu/schemas/inspire_dls/1.0/inspire_dls.xsd">
    <ows:ServiceIdentification>
        <ows:Title/>
        <ows:Abstract/>
        <ows:ServiceType>urn:ogc:service:wcs</ows:ServiceType>
        <ows:ServiceTypeVersion>2.0.1</ows:ServiceTypeVersion>
        <ows:ServiceTypeVersion>1.1.1</ows:ServiceTypeVersion>
        <ows:ServiceTypeVersion>1.1.0</ows:ServiceTypeVersion>
        <ows:Profile>http://www.opengis.net/spec/WCS/2.0/conf/core</ows:Profile>
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            </ows:BoundingBox>
            <ows:WGS84BoundingBox>
                <ows:LowerCorner>32.70697763422942 29.149161895068794</ows:LowerCorner>
                <ows:UpperCorner>37.071150249328454 34.62339561526329</ows:UpperCorner>
            </ows:WGS84BoundingBox>
        </wcs:CoverageSummary>
        <wcs:CoverageSummary>
            <ows:Title>srtm30</ows:Title>
            <ows:Keywords>
                <ows:Keyword>srtm30</ows:Keyword>
                <ows:Keyword>WCS</ows:Keyword>
                <ows:Keyword>GeoTIFF</ows:Keyword>
            </ows:Keywords>
            <wcs:CoverageId>dem__srtm30-DTM</wcs:CoverageId>
            <wcs:CoverageSubtype>RectifiedGridCoverage</wcs:CoverageSubtype>
            <ows:BoundingBox crs="http://www.opengis.net/def/crs/EPSG/0/4326">
                <ows:LowerCorner>34.716796875 32.16796875</ows:LowerCorner>
                <ows:UpperCorner>35.68359375 32.958984375</ows:UpperCorner>
            </ows:BoundingBox>
            <ows:WGS84BoundingBox>
                <ows:LowerCorner>34.716796875 32.16796875</ows:LowerCorner>
                <ows:UpperCorner>35.68359375 32.958984375</ows:UpperCorner>
            </ows:WGS84BoundingBox>
        </wcs:CoverageSummary>
        <wcs:Extension/>
    </wcs:Contents>
</wcs:Capabilities>

Understanding the capabilities response

Read more here.

Extraction service coverage metadata

info

Read more about this request here.

For this step we need the coverageId of a product we selected from the previous steps. The wanted ID should look like this: <productId>-<productType>. Lets select the product srtm30, this means our ID will be srtm30-DTM and our request will be:

curl --location --request GET '<WCS_SERVICE_URL>/wcs?request=DescribeCoverage&version=2.0.1&coverageId=srtm30-DTM&token=<token>'

Response

<?xml version="1.0" encoding="UTF-8"?>
<wcs:CoverageDescriptions xmlns:wcs="http://www.opengis.net/wcs/2.0" xmlns:ows="http://www.opengis.net/ows/2.0" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:gmlcov="http://www.opengis.net/gmlcov/1.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:swe="http://www.opengis.net/swe/2.0" xmlns:wcsgs="http://www.geoserver.org/wcsgs/2.0" xsi:schemaLocation=" http://www.opengis.net/wcs/2.0 http://schemas.opengis.net/wcs/2.0/wcsDescribeCoverage.xsd http://www.geoserver.org/wcsgs/2.0 https://poc-geoserver-dem-wcs-dev.apps.j1lk3njp.eastus.aroapp.io/schemas/wcs/2.0/wcsgs.xsd">
    <wcs:CoverageDescription gml:id="dem__srtm30">
        <gml:description>Generated from GeoTIFF</gml:description>
        <gml:name>srtm30</gml:name>
        <gml:boundedBy>
            <gml:Envelope srsName="http://www.opengis.net/def/crs/EPSG/0/4326" axisLabels="Lat Long" uomLabels="Deg Deg" srsDimension="2">
                <gml:lowerCorner>32.16796875 34.716796875</gml:lowerCorner>
                <gml:upperCorner>32.958984375 35.68359375</gml:upperCorner>
            </gml:Envelope>
        </gml:boundedBy>
        <wcs:CoverageId>dem__srtm30</wcs:CoverageId>
        <gml:coverageFunction>
            <gml:GridFunction>
                <gml:sequenceRule axisOrder="+2 +1">Linear</gml:sequenceRule>
                <gml:startPoint>0 0</gml:startPoint>
            </gml:GridFunction>
        </gml:coverageFunction>
        <gmlcov:metadata>
            <gmlcov:Extension>
                <ows:Keywords>
                    <ows:Keyword>srtm30</ows:Keyword>
                    <ows:Keyword>WCS</ows:Keyword>
                    <ows:Keyword>GeoTIFF</ows:Keyword>
                </ows:Keywords>
            </gmlcov:Extension>
        </gmlcov:metadata>
        <gml:domainSet>
            <gml:RectifiedGrid gml:id="grid00__dem__srtm30" dimension="2">
                <gml:limits>
                    <gml:GridEnvelope>
                        <gml:low>0 0</gml:low>
                        <gml:high>2815 2303</gml:high>
                    </gml:GridEnvelope>
                </gml:limits>
                <gml:axisLabels>i j</gml:axisLabels>
                <gml:origin>
                    <gml:Point gml:id="p00_dem__srtm30" srsName="http://www.opengis.net/def/crs/EPSG/0/4326">
                        <gml:pos>32.95881271362305 34.71696853637695</gml:pos>
                    </gml:Point>
                </gml:origin>
                <gml:offsetVector srsName="http://www.opengis.net/def/crs/EPSG/0/4326">0.0 3.4332275390625E-4</gml:offsetVector>
                <gml:offsetVector srsName="http://www.opengis.net/def/crs/EPSG/0/4326">-3.4332275390625E-4 0.0</gml:offsetVector>
            </gml:RectifiedGrid>
        </gml:domainSet>
        <gmlcov:rangeType>
            <swe:DataRecord xmlns:swe="http://www.opengis.net/swe/2.0">
                <swe:field name="GRAY_INDEX">
                    <swe:Quantity>
                        <swe:description>GRAY_INDEX</swe:description>
                        <swe:nilValues>
                            <swe:NilValues>
                                <swe:nilValue reason="http://www.opengis.net/def/nil/OGC/0/unknown">-32768.0</swe:nilValue>
                            </swe:NilValues>
                        </swe:nilValues>
                        <swe:uom code="W.m-2.Sr-1"/>
                        <swe:constraint>
                            <swe:AllowedValues>
                                <swe:interval>-32768 32767</swe:interval>
                            </swe:AllowedValues>
                        </swe:constraint>
                    </swe:Quantity>
                </swe:field>
            </swe:DataRecord>
        </gmlcov:rangeType>
        <wcs:ServiceParameters>
            <wcs:CoverageSubtype>RectifiedGridCoverage</wcs:CoverageSubtype>
            <wcs:nativeFormat>image/tiff</wcs:nativeFormat>
        </wcs:ServiceParameters>
    </wcs:CoverageDescription>
</wcs:CoverageDescriptions>

You should save the srsName, axisLabels and srsDimension attributes for step 3.

Understanding the extraction service coverage metadata

Read more here.

Request elevation data (Step 3)

Now we can actually make a request for elevation data.

danger

We recommend you don't use the following query parameters when making requests:

• scalesize
• scaleFactor
• scaleAxes
• outputCRS
• interpolation

These parameters require additional calculations on the server-side which means that the original data is changed on-the-fly resulting in new data with different attributes such as resolution or accuracy. Any use of these parameters is the sole responsibility of the user as we cannot know the resulting requests metadata.

For all of the examples in this section we need the following parameters:

• coverageId

In the examples we show the use of specific parameter values, in order to understand what other values you can you review the service capabilities.

Get whole coverage

warning

To maintain system stability and prevent oversized payloads, the service enforces a maximum output size limit. Exceeding this limit will trigger the following error:

<?xml version="1.0" encoding="UTF-8"?>
<ows:ExceptionReport xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ows="http://www.opengis.net/ows/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0.0" xsi:schemaLocation="http://www.opengis.net/ows/2.0 http://schemas.opengis.net/ows/2.0/owsExceptionReport.xsd">
    <ows:Exception exceptionCode="NoApplicableCode">
        <ows:ExceptionText>This request is trying to generate too much data, the limit is 1500MB but the actual amount of bytes to be written in the output is 5000MB</ows:ExceptionText>
    </ows:Exception>
</ows:ExceptionReport>

Most coverages will be larger than the limit so we suggest you directly download the source file.

Here we request the whole coverage in the geotiff format.

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30-DTM&format=image/tiff;application=geotiff&token=<token>'

Get by BBOX

In most cases, we know which geographical area is of significance to us. This means that we can request the specific BBOX as a subset of the selected coverage:

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30&format=image/tiff;application=geotiff&subset=Lat(32.35306,32.49437)&subset=Long(35.13102,35.37051)&token=<token>'

Convert to other CRS

In some situations we will have data in a geographical area in a different CRS than we expect for our calculations. In this case we can ask the service to convert the output to the wanted CRS.

Here we are making a request to a coverage in EPSG:4326 and requesting it in EPSG:3857:

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30-DTM&format=image/tiff;application=geotiff&outputCRS=EPSG:3857&token=<token>'

Scale image size (pixels)

Scale Size

Set the output image to be a fixed amount of pixels.

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30&format=image/tiff;application=geotiff&scaleSize=i(256),j(256)&token=<token>'

Scale Factor

Set the output image size to be a certain factor from it's original size.

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30&format=image/tiff;application=geotiff&scaleFactor=0.1&token=<token>'

Scale Axes

Set the output image size to be a certain factor from it's original size for each axes.

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30&format=image/tiff;application=geotiff&scaleAxes=i(0.1),j(0.2)&token=<token>'

Change interpolation method

There is an option to set the wanted interpolation method. To see a full list of the available methods see the capabilities.

note

The default method is linear.

curl --location '<WCS_SERVICE_URL>/wcs?request=GetCoverage&version=2.0.1&coverageId=srtm30&format=image/tiff;application=geotiff&interpolation=http://www.opengis.net/def/interpolation/OGC/1/nearest-neighbor&token=<token>'