<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><div data-html-editor-font-wrapper="true" style="font-family: arial, sans-serif; font-size: 13px;">Hi list,<br><br>I have some heat map files which I want to do some spatial analyisis on.<br><br>I am wondering what the best way to proceed. I admin that I have never used the raster part of postgis before.<br><br>I have two choices<br><br>1. Convert the raster files to shape files and load the shape files in to postgis.<br>2. Load the raster files and have a play with some of the raster operators.<br><br>Has anybody got any suggestions as to the best way to proceed?<br><br>The heatmap are geotiff files and are correctly geoferenced and can be any colour that I choose.<br><br>As a side issue are there any colour combinations that are easier to convert form raster to vector for example would a black/white image digitise better than an image coloured in many different shades of orange?<br><br>regards<br><br>Dave.<br> </div></body></html>