0
votes
1answer
17 views

How to export query result on raster table in PostGIS

I did success query on a raster table in postGIS(raster data clipped by a vector polygon), now I want to view the query result in QGIS. But how to export the query result to another table. In vector ...
0
votes
0answers
26 views

The difference when querying raster and vector

Hi everyone I have two queries have the same meaning but different results. Why is there a difference?. Queries are true? query 1: query 2:
4
votes
1answer
61 views

Finding percentage of feature in a raster

I am attempting to find the percentage of polygon features at a 5 meter resolution that are located inside each 25km raster cell. I am looking to assign percentages to each cell based on the ...
0
votes
1answer
42 views

Isolate And Save Raster Features From Existing Multivalue Raster Map

I have Cyprus Corine map with 44 different types of land use. I want to run a raster calculator query or any other way to isolate the areas with codes 10 to 22 and 26 to 34, all other values 1 to 44 ...
10
votes
3answers
727 views

How to speed up queries for raster databases?

I have a raster database in postgresql/postgis with these columns: (ID, rast, data_of_data). 'rast' is the column that has raster files in WKT format. An example query to find the DN value of a ...
4
votes
2answers
615 views

Spatial query of raster data

I have population distribution data as a raster layer and exposure contours as vector (polygon) layers. What I'd like to do is use the vector layer to estimate the population indicated from the raster ...
2
votes
2answers
845 views

query raster in ArcGIS 10

I am using ArcGIS 10 (includes spatial and geostatistical analyst). I have a raster (GRID) with a value range of -167 to 18. I would like to query the raster and create a new one with only the values ...