I'm running QGIS compiled from Subversion this morning, with support libraries as provided by Ubuntu 10.10. I'm having a bit of trouble figuring out the measuring tool. Short version: To get numbers that seem to make sense I have to click of "Ellipsoidal", and then get what look like right numbers in feet, but they're labeled "degrees".
Long version follows: I downloaded the "Parcels" shapefile data from https://gis.sonoma-county.org/catalog.asp Empty project, added PAR_PARCELS.shp as a layer. Right click on the layer, search for APN 008-454-003 (my house), click the "Zoom to Selection" icon. Select the line measurement tool, measure the front side of my lot, get 273.71km (it should be 52 feet, or 15.85 meters). Okay, I've clearly got a projection issue. Open up the Layer Properties box, see: - * Generated CRS (+proj=lcc +lat_1=38.33333333333334 +lat_2=39.83333333333334 +lat_0=37.66666666666666 +lon_0=-122 +x_0=2000000 +y_0=500000.0000000001 +ellps=GRS80 +datum=NAD83 +to_meter=0.3048006096012192 +no_defs) Which to my untutored eye seems right (ie: the lat and lon numbers aren't completely whack). But I can try "Specify CRS", and I put in NAD83/California zone 2 (ftUS) EPSG:2226 208 (EPSG:2226 is what looks right when I manipulate this data with other tools, like Python and Mapnik). Now it seems to be measuring 269.101km. And the back of the lot (the assessor's office tells me this is rectangular) measures 5,781.169km. If I click off the "Ellipsoidal" check box then I get a number that's closer to what I expect, but it's labeled "degrees". Can anyone point me to what I should be reading to explain this? Thanks. Dan _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
