WMS GetMap with BBOX and GEOMETRY=POLYGON

WMS page


said BBOX is a required parameter, so the following request is correct when I try to have clipped imagery according to the specified polygon axis.

WMS GetMap with BBOX and GEOMETRY=POLYGON

However, the imagery response is also available without BBOX parameter as following.

WMS GetMap with GEOMETRY=POLYGON

Then I found out there are tiny shape difference between them. What is this difference? Which one should we request for this purpose? If BBOX is not necessary, that would be convenient .

There are three options:

  1. BBOX only - you will get data over the chosen BBOX
  2. GEOMETRY only - you will get data over the chosen geometry, clipped to this specific geometry.
  3. BBOX + GEOMETRY - you will get data over an intersection between BBOX and GEOMETRY, clipped to the GEOMETRY.

Then it depends on the use-case.

1 Like

Thank you.
It made everything clear!