EuroSDR Projects - Host Ireland

Possibly only parts of images will be distributed to reduce data size.
Some areas should include fourfold image overlap.
Date and time of image acquisition for shadow analysis.
DTM: As typically existing in Europe. Possibly also higher quality derived by ALS.
DSM: Derived from matching and/or ALS.
Orthoimages: It is an open question whether orthoimages should be generated using DTM or
DSM.
Optionally associated topographic maps in digital raster form for overview and other purposes, if
possible divided in separate color layers, and at scale ca. 1:25,000
Vector GIS or map information comparable to a scale of 1:25,000 including roads, forest
boundaries, water body boundaries, (possibly administrative) built-up area boundaries. Data for
roads should be topologically structured and include additional information, e.g., road classes and
attributes such as width, existence, and type/color of road marks, etc. For road vector data, error
statistics should be given, e.g., mean, RMS, maximum absolute error. For geometric attributes,
such as width, mean, RMS, and range might be useful. Road data should preferably include medial
axes and not the road sides/edges. If possible height information should be made available for the
road points, e.g., by means of interpolation using a DTM or DSM. Railway lines, and small
features like paths, small bridges, etc., should be excluded.
Formats for distribution of data should be common. For raster, simple and tiled TIFF, for vector,
ASCII, DXF, DGN, Arc/Shape, etc., will be used. Details will be specified at a later stage. Multiple
(2-3) formats for each data set may be used.
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