Raster

Raster Overview

Orthophoto images are generated from satellite imagery or aerial photography. In the case of aerial photography, the raw frames are matched and resolved into photo blocks. Then, they and geometrically corrected (using DTM), anchored to well-known points, visually improved, and assembled into a homogeneous orthophoto mosaic, which can be combined of multiple files. A discrete layer represents a geographical region and is composed of multiple orthophoto mosaics with the same resolution, color scheme, and classification. A discrete layer can be included in the best mosaic, a universal map which is a fusion of multiple discrete layers.

Terms

Term	Description
Raster Geodetic Datum	World Geodetic System of WGS 84 (also known as WGS 1984 ensemble: EPSG:4326 for 2D coordinate reference system (CRS))
Raster Map projection	Latitude / Longitude Projection
Raster Best Practice Protocol	WMTS
Raster Tiling scheme	InspireCRS84Quad (World CRS84 TileMatrixSet), That tiling schemes consists of two 256x256 tiles at its zoom level 0, in EPSG:4326 CRS, with extent in longitude in the range [-180,180] and in latitude in the range [-90,90].
Raster Tile Size	256*256
Raster Tile Format	PNG / JPEG
Auth token	A JWT token (you can aquire it by contacting our product owner) for raster services passed via http QUERY_PARAM. There are different kinds of token permissions (raster catalog, map, export, etc.. services)
Zoom Level	The layer zoom level is determined by the field mc:maxResolutionDeg, the zoom level is calculated by the tiling scheme below (Pixel Size (degrees) is maxResolutionDeg), for example, for the following mc:maxResolutionDeg 2.14577E-05 >= resolution > 1.07288E-05 a zoom level of 15 will be created.

Raster Tiling scheme In Detail

warning

Tile Size (degrees) is cut after 9 decimal points and Pixel Size (meters) is rounded to 2 decimal points.

Zoom Level Id	Matrix Width (tiles)	Matrix Height (tiles)	Tile Size (degrees)	Pixel Size (degrees)	Tile Size* (meters)	Pixel Size* (meters)
0	2	1	180	0.703125	20,037,508.34	78,271.52
1	4	2	90	0.3515625	10,018,754.17	39,135.76
2	8	4	45	0.17578125	5,009,377.09	19,567.88
3	16	8	22.5	0.087890625	2,504,688.54	9,783.94
4	32	16	11.25	0.0439453125	1,252,344.27	4,891.97
5	64	32	5.625	0.02197265625	626,172.14	2,445.98
6	128	64	2.8125	0.010986328125	313,086.07	1,222.99
7	256	128	1.40625	0.0054931640625	156,543.03	611.50
8	512	256	0.703125	0.00274658203125	78,271.52	305.75
9	1024	512	0.3515625	0.001373291015625	39,135.76	152.87
10	2048	1024	0.17578125	0.0006866455078125	19,567.88	76.44
11	4096	2048	0.087890625	0.00034332275390625	9,783.94	38.22
12	8192	4096	0.043945313	0.000171661376953125	4,891.97	19.11
13	16384	8192	0.021972656	0.0000858306884765625	2,445.98	9.55
14	32768	16384	0.010986328	0.0000429153442382812	1,222.99	4.78
15	65536	32768	0.005493164	0.0000214576721191406	611.50	2.39
16	131072	65536	0.002746582	0.0000107288360595703	305.75	1.19
17	262144	131072	0.001373291	0.00000536441802978516	152.87	0.60
18	524288	262144	0.000686646	0.00000268220901489258	76.44	0.30
19	1048576	524288	0.000343323	0.00000134110450744629	38.22	0.15
20	2097152	1048576	0.000171662	0.000000670552253723145	19.11	0.075
21	4194304	2097152	0.000085831	0.000000335276126861572	9.55	0.037
22	8388608	4194304	0.0000429155	0.000000167638063430786	4.78	0.0185