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3

Firstly, it's not necessary to project the data to webmercator, since tilemill can project on the fly. But if you have a large dataset, then it helps to have data in WebMercator. You should note that according to the KML standard, the KML data can only be in WGS84 Latlong, i.e. EPSG:4326. Hence we'll have to project this data to some other format. If you ...


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Use the gdalwarp utility. gdalwarp -s_srs epsg:4326 -t_srs epsg:3857 input.tif output.tif


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I have constructed below a well-known text (WKT) file for the projected coordinate system that your data is using. You should copy it to a text file that has an extension ".prj". The WKT string must be a single line. Put the text file into your ArcGIS installation folder, then "Coordinate Systems, Projected Coordinate Systems". When you want to project your ...


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You should modify the table, by adding 4 fields: x1, y1, x2, y2 or similar. Now do table update: x1=objectnodex(obj,1,1) y1=objectnodey(obj,1,1) For the end it is a little trickier: x2=objectnodex(obj,1,objectinfo(obj,22)) y2=objectnodey(obj,1,objectinfo(obj,22)) The above only works with polylines, not lines. Since the default coordsys is wgs84, you ...


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As per this forum post, I would try: Checking your environment settings (extents, etc.) Checking that you have chosen the correct transformation in the project raster tool.


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Use EPSG:3857. That is the official EPSG code number for Google mercator projection. 900913 was incorproated in GDAL some toime ago, but is now dropped in favour of 3857.



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