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Im going to create a Gauss-Boaga location where to load some
georeferenced maps. This is what I have done:<br>
<br>
<b>1.</b><br>
<br>
Please specify the coordinate system for location <tempo><br>
A x,y<br>
B Latitude-Longitude<br>
C UTM<br>
D Other Projection<br>
RETURN to cancel<br>
<br>
> D -> I'll create the location with the Other Projection
procedure.<br>
<b><br>
2.</b><br>
<br>
Please specify projection name<br>
Enter 'list' for the list of available projections<br>
Hit RETURN to cancel request<br>
>tmerc -> i think is the right projection<br>
<br>
<b>3.</b><br>
<br>
Please specify datum name<br>
Enter 'list' for the list of available datums<br>
or 'custom' if you wish to enter custom parameters<br>
Hit RETURN to cancel request<br>
>rome40 -> it is right, isn't?<br>
<br>
<b>4. ------here is the problem----------</b><br>
<br>
Number Details<br>
---<br>
1 Used in Italy (Peninsular Part)<br>
(PROJ.4 Params
towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68)<br>
Accuracy 3-4m<br>
---<br>
2 Used in Italy (Sardinia)<br>
(PROJ.4 Params
towgs84=-168.6,-34.0,38.6,-0.374,-0.679,-1.379,-9.48)<br>
Accuracy 3-4m<br>
---<br>
3 Used in Italy (Sicily)<br>
(PROJ.4 Params
towgs84=-50.2,-50.4,84.8,-0.690,-2.012,0.459,-28.08)<br>
Accuracy 3-4m<br>
---<br>
4 Used in Default rome40 region<br>
(PROJ.4 Params towgs84=-225.000,-65.000,9.000)<br>
Default 3-Parameter Transformation<br>
---<br>
<br>
What is the right number? i would think that is the <i><b>1st</b></i>
(couse im in the north of Italy) or the <i><b>4th</b></i><br>
How can i know which towgs84 parameter have i to use? <br>
and.. if the right parameter is the first, why is there the 4th
parameter, that is so strange?<br>
<br>
<br>
sorry for my english.... thanks<br>
<br>
Luca P.<br>
<br>
<BR>
<br>
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