1

I have polygon data on coral reefs at great barrier reef and separate point data for areas of coral bleaching. I have created a clip that only includes points that exist with in the reef polygons. However I need to be able to identify polygons that have bleaching points in them from those that do not. So for example I would like to be able to click on a polygon that has a bleaching point in it and it automatically select all the other polygons that do?

2 Answers 2

3

you can use a select by location (from the selection menu) to identify all polygons that contain your bleaching data points. then add a field (options/add field...) to the reef polygon attribute table, and calculate values for the selected features with the field calculator (right click on the field name, select 'field calculator')to assign a value to differentiate between bleached and unbleached reefs (Y/N or 1/0).

0
2

If you want to select all polygons with a bleaching point in them, you can "select > select by location".

If you want to select all polgon with a given characterstic when you click on it, you need to use "dissolve" in order to have multipart poylgon. The first step would be a "spatial join" in order to find out which polygons include a point .

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.