MapInfo Pro

When creating a viewshed, there is an option to insert null values in all cells outside the viewshed. But how can I insert null values in all the blue cells where the object is not visible from. The viewshed covers the background map. I can set the layer transparency to 50% to see the background map, but it would be even better if I could replace all the blue parts of the viewshed with null values to make these 100% transparent, and the rest 50% transparent. Would be cool with a checkbox "Null value in cells where point(s) is not visible" in the viewshed options.

Can I run some tool/command to insert null values in all the blue cells?

Hi Hans,

There is a feature in RASTER > Raster Operations > Calculator > which can be used to reassign values to grid per specific conditions. I was looking at using the 'Replace with variable' expression syntax, and struggled a bit to get it to recognize using 'null' to replace all '0' values. It looks like it is not accepting null (string) as a variable.

Mitchell Holliday one of our subject matter experts kindly suggested to use the following syntax:

cond(Input_1 = 0, null, Input_1)

I've tested this and was able to assign null to all cells with '0' values successfully.

Hope this helps!

Dave

This works, thanks. Only thing is the red values turn out blue. I found another way. If I double click the style to the left of the layer name in the Map (explorer tab) I get the "Adjust Image Styles". In here, I can select a transparency color and click the blue color in the raster image, to make it transparent.