topic Problem with extract by mask in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/problem-with-extract-by-mask/m-p/339669#M4774 <HTML><HEAD></HEAD><BODY><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I'm having trouble with the spatial analyst tool 'extract by mask'. I converted a point dataset into a raster (points at 0.5 degree intervals) and used that raster dataset to extract by mask. I extracted raster cells based on river basin shapefiles (irregular polygons) as masks. This works fine as such but some of the basin shapefiles are too small or or a wrong shape and consequently no raster cells are extracted for these. I have attached a figure of the different layers for clarification.</SPAN><BR /><SPAN>I need each river basin to have at least one corresponding raster cell so could you please suggest a way to get round this problem? Is is possible to adjust the area that the shapefile needs to cover in each raster cell in order to be extracted&nbsp; (e.g. assuming that at the moment it is only picked up if it covers at least 50% of the raster cell)? Or is there possible another tool I could use?</SPAN><BR /><SPAN>Thank you for the help.</SPAN></BODY></HTML> Mon, 14 Jun 2010 23:35:26 GMT AnnaUkkola 2010-06-14T23:35:26Z Problem with extract by mask https://community.esri.com/t5/arcgis-spatial-analyst-questions/problem-with-extract-by-mask/m-p/339669#M4774 <HTML><HEAD></HEAD><BODY><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I'm having trouble with the spatial analyst tool 'extract by mask'. I converted a point dataset into a raster (points at 0.5 degree intervals) and used that raster dataset to extract by mask. I extracted raster cells based on river basin shapefiles (irregular polygons) as masks. This works fine as such but some of the basin shapefiles are too small or or a wrong shape and consequently no raster cells are extracted for these. I have attached a figure of the different layers for clarification.</SPAN><BR /><SPAN>I need each river basin to have at least one corresponding raster cell so could you please suggest a way to get round this problem? Is is possible to adjust the area that the shapefile needs to cover in each raster cell in order to be extracted&nbsp; (e.g. assuming that at the moment it is only picked up if it covers at least 50% of the raster cell)? Or is there possible another tool I could use?</SPAN><BR /><SPAN>Thank you for the help.</SPAN></BODY></HTML> Mon, 14 Jun 2010 23:35:26 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/problem-with-extract-by-mask/m-p/339669#M4774 AnnaUkkola 2010-06-14T23:35:26Z