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I'll answer on the chance you're using QGIS as I had this issue before. Open the attribute table, toggle editing and open field calculator. Make sure 'create a new field' is checked and call your new field something like AREA_TRUE. Make sure the output field type is set to decimal number and turn up the precision to 3 to preserve accuracy. Then in the ...
If you are using an ESRI program. Open the attribute table. Right-click at the top of the column (in the field name) and choose "Calculate Geometry..." Choose Area and Units - km in your case if you want km2. Good Luck and don't cut any pandas in half while splitting polygons. Scott b.
It should not matter whether it is uses a geographic or projected coordinate system. The only way of finding out would be to look at the metadata. It may or may not have come with metadata. If it is a shapefile, you will have to right click on the title of the field at the top of the table and click on calculate geometry to update the values. If it is a ...
simple. before performing raster to topo you need to add a single polygon (input) which will be your desired boundary and change type to boundary (yes there is a dropdown key there) goodluck :)
Make sure that vector and raster layer have the same CRS, and their extent should have reasonable and matching values. Both should be saved to the file system, because layers build in memory (like ASCII and CSV files) don't have a CRS saved to disk. Even if you specified it under Settings -> Options, CRS Tab, you should not be prompted for a CRS if ...
I could solve the issue. I just has to change the nodata parameter from "#" (second one in code above) to "256". After doing this, the code works.
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