[GRASS-user] Re: Exporting Vector data to SHP (v.out.ogr)- takes
a lot of time
Luis Lisboa
luislisboa1975 at gmail.com
Fri Nov 12 07:46:14 EST 2010
Hello Achim... Not really. It didn't work
Let me start from the beggining:
1- My orioginal raster file has the following:
| Type of Map: raster Number of Categories: 11
|
| Data Type: CELL
|
| Rows: 5381
|
| Columns: 4481
|
| Total Cells: 24112261
|
| Projection: UTM (zone -24)
|
| N: 9659623.5017993 S: 8045266.26306668 Res: 300.01063719
|
| E: 1077874.87767815 W: -266394.50364563 Res: 299.993167
|
| Range of data: min = 1 max = 11
|
It's a landcover map
2- I convert to vectorusing the following expression
r.to.vect -v input=teste01_LULC at Regional output=teste05 feature=area
and it returns:
Extracting areas...
Building topology for vector map <teste05>...
Registering primiti 907000907256 primitives registered
3527832 vertices registered
Building areas...
321179 areas built
85875 isles built
Attaching islands...
Attaching centroids...
Number of nodes: 671952
Number of primitives: 907256
Number of points: 0
Number of lines: 0
Number of boundaries: 586103
Number of centroids: 321153
Number of areas: 321179
Number of isles: 85875
Number of areas without centroid: 26
r.to.vect complete.
My vector is:
|----------------------------------------------------------------------------|
| Type of Map: vector (level: 2)
|
|
|
| Number of points: 0 Number of areas: 321179
|
| Number of lines: 0 Number of islands: 85875
|
| Number of boundaries: 586103 Number of faces: 0
|
| Number of centroids: 321153 Number of kernels: 0
|
|
|
| Map is 3D: No
|
| Number of dblinks: 1
|
|
|
| Projection: Universal Transverse Mercator (zone 0)
|
| N: 9659623.5017993 S: 8045266.26306668
|
| E: 911978.65632755 W: -266394.50364563
|
|
|
| Digitization threshold: 0
|
| Comments:
|
|
|
+----------------------------------------------------------------------------+
this is a vector composed by areas (as far as I wanted and I believe)
3- I reduced the region in order to export just a piece
4- I exported but, when I open it in QGIS I get an empty vector file
5- Then again: v.out.ogr -c input=teste05 at Regional type=area
dsn=c:\teste07.shp
Exporting 321179 areas (may take some time)...
And after 20 minutes it seems freezed
It this too much polygons?
On Fri, Nov 12, 2010 at 9:06 AM, Achim Kisseler <ak7 at jupiter.uni-freiburg.de
> wrote:
>
>
> Am 12.11.2010 09:40, schrieb Luis Lisboa:
>
> The problem is that, I left it this night processing and, when I returned
>> it has freezed. So, v.out.ogr is not being able to export vector files
>> produced by r.to.vect... As I said, maybe it's related with some option in
>> r.to.vect that is messing this up. Or something related with tables.
>>
>> Can anyone give me some tips on this?
>>
>
> I guess it freezes because it uses so much memory.
>
> Please check if v.out.ogr works with a small vector map. E.g. shrink region
> before r.to.vect or choose only some features from the vector map to export.
>
> ?
>
> Achim
>
>>
>> Thanks
>>
>> Luis
>>
>>
>> ...that´ll be a HUGE vector file!
>>> So it´s normal, that it takes some minutes.
>>>
>>
>>
>> On Thu, Nov 11, 2010 at 3:08 PM, Luis Lisboa <luislisboa1975 at gmail.com
>> <mailto:luislisboa1975 at gmail.com>> wrote:
>>
>> Greetings
>>
>> I have produced a vector map (with r.to.vector) with the following
>> metadata:
>> v.info <http://v.info> test01
>>
>>
>> +----------------------------------------------------------------------------+
>> | Layer: teste01
>> |
>> | Mapset: Regional
>> |
>> | Location: Country
>> |
>> | Database: E:\v3
>> |
>> | Title:
>> |
>> | Map scale: 1:1
>> |
>> | Map format: native
>> |
>> | Name of creator: orbit
>> |
>> | Organization:
>> |
>> | Source date: Tue Nov 09 11:11:40 2010
>> |
>>
>> |----------------------------------------------------------------------------|
>> | Type of Map: vector (level: 2)
>> |
>> |
>> |
>> | Number of points: 0 Number of areas:
>> 213680 |
>> | Number of lines: 0 Number of islands:
>> 73649 |
>> | Number of boundaries: 348770 Number of faces:
>> 0 |
>> | Number of centroids: 213666 Number of kernels:
>> 0 |
>> |
>> |
>> | Map is 3D: No
>> |
>> | Number of dblinks: 1
>> |
>> |
>> |
>> | Projection: Universal Transverse Mercator (zone 0)
>> |
>> | N: 8832707.83027649 S: 7028073.62772369
>> |
>> | E: 1347458.42001915 W: 200792.5777576
>> |
>> |
>> |
>> | Digitization threshold: 0
>> |
>> | Comments:
>> |
>> |
>> |
>>
>> +----------------------------------------------------------------------------+
>>
>>
>> Now I'm trying to export it to SHAPEFILE but, after 10 minutes the
>> processing bar is not even in 40%. What might be happening? I mean,
>> is it some error with the vector or when I convert to vector (from
>> raster)? Because, taking more than 10 minutes to export to vector
>> it's not normal (I guess) and taking nearly 7 min to convert to
>> vector also...
>>
>> Thanks for the reply
>> Luis L
>>
>>
>>
>>
>> _______________________________________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>
>
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