<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#006600" bgcolor="#FFFFFF">
Hello,<br>
I'm using the wounderful (:)) qgis Dufour 2.0.1 and I'm trying to
calculate area and perimeter from a simple shapefile with CRS
WGS84UTM32 following these steps:<br>
1) set up the CRS of the project to WGS84UTM32 (on the fly
transformation is checked)<br>
2) load the shapefile<br>
3) click on it with the identifier tool (identify features) I
obtain:<br>
- area: 19.321 km²<br>
- perimeter: 0.221 m (!!!!)<br>
4) then I try to calculate in the table ...<br>
- area: 2,301,030,218 while in the preview was 19,320,205.394043
(!!!!)<br>
- perimeter: 2,859,402,286 while in the preview was
20,391.7709396732 (!!!!)<br>
<br>
then I modify the general CRS settings for new project (settings
--> options) to WGS84UTM32 and, after reloading qgis, I did steps
1, 2 again and I obtained:<br>
3bis) in the identify tool:<br>
- area: 19.321 km²<br>
- perimeter: 20.392 km<br>
4bis) and in table:<br>
- area: 19,320,205.3<br>
- perimeter: 20,391.771<br>
<br>
The second way seems to give more consistent results.<br>
But why should I setup the general CRS option if I've already setup
the project CRS?<br>
Shouldn't the geometry function all referred to the project
settings?<br>
There is something of wrong in my first procedure?<br>
Thank you in advance<br>
rob<br>
<br>
<br>
<br>
<br>
<br>
</body>
</html>