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Oct
14
answered Convert PNG to GeoTiff using GDAL
Oct
14
comment Geo-referencing an old map
I guess you have not yet collected any ground control points.
Oct
14
comment Proj4js: Is this correct implementation of Azimuthal Equidistant relative to an arbitrary center?
I have not looked into that bug deeper lately, but it seems to me that it happens for points on the backside only. For your example, try both methods and compare the results. The ellipsoid should have more accurate values.
Oct
13
answered Proj4js: Is this correct implementation of Azimuthal Equidistant relative to an arbitrary center?
Oct
13
revised Generating a GDAL script through the QGIS Georeferencer
edited tags
Oct
13
comment Generating a GDAL script through the QGIS Georeferencer
The strange thing for me is when I georeference a jpg in QGIS, the srcY in the GCP table are all negative but in the GDAL commandline they are inverted to positive, giving the right referencing in the end. Seems like a bug if an .asc file is loaded.
Oct
13
revised Geo-referencing an old map
added 362 characters in body
Oct
13
comment Transforming Robinson to Equirectangular
You get better results if you use the projection it looks like. This is the Robinson projection: en.wikipedia.org/wiki/File:Robinson_projection_SW.jpg and it looks rather similar.
Oct
13
answered Transforming Robinson to Equirectangular
Oct
13
revised Geo-referencing an old map
added 6 characters in body
Oct
13
answered Geo-referencing an old map
Oct
12
revised Is there a command line tool for converting projection in .prj and GeoTiff to EPSG codes?
edited body
Oct
12
revised Is there a command line tool for converting projection in .prj and GeoTiff to EPSG codes?
added 21 characters in body
Oct
12
comment Regional Large Scale Map Projection Choice
But that applies to all projected CRS. You can have projections with good results in distance, area or angles. It is up to you what is important.
Oct
12
answered Is there a command line tool for converting projection in .prj and GeoTiff to EPSG codes?
Oct
11
comment Export to Open Layers plugin doesn't work with Raster and WMS
QGIS can reproject the WMS internally from 4326 to 3857, but openlayers can not.
Oct
11
answered extracting geographic location from NOAA NARR grib
Oct
11
comment Generating a GDAL script through the QGIS Georeferencer
Can you share the .asc source file via dropbox or similar?
Oct
11
comment Export to Open Layers plugin doesn't work with Raster and WMS
See my extended answer. But I doubt that the WMS you mentioned supports EPSG:3857.
Oct
11
revised Export to Open Layers plugin doesn't work with Raster and WMS
added 563 characters in body