[GRASS-user] Problems using v.surf.idw

Anna Petrášová kratochanna at gmail.com
Fri Apr 16 06:33:04 PDT 2021 

Hi Luis,

could be because you haven't provided the attribute column. It should
probably fail with a message in this case...

Anna

On Fri, Apr 16, 2021 at 5:08 AM Luí­s Moreira de Sousa via grass-user <
grass-user at lists.osgeo.org> wrote:

> Hi all,
>
> I have been trying to use v.surf.idw the past few days without success.
>
> The image attached is a screen capture from the Map Display. There is a
> category
> raster (green regions) with a gap (lake Chad) that must be filled with the
> nearest neighbour category. The strategy is to create a points vector from
> the raster
> and then apply v.surf.idw with npoints=1.
>
> If the density of points is too high (> 10 000) the module fails with the
> message "Killed". With fewer points the module fails with the message
> "ERROR: No points found". Below is a log with an example. I have
> tried many different combinations of resolution and number of points, I
> also tried different mapsets, SQLite and Postgres back-ends, but the result
> is always the same.
>
> What can be going wrong?
>
> P.S.: there is previous thread with similar symptoms, but seems to have
> been a different issue:
> http://osgeo-org.1560.x6.nabble.com/v-surf-idw-Not-Working-td5457170.html
>
> Thank you.
>
> Luís
>
> GRASS 7.8.2 (S4AHomolosine):~ > g.region nsres=20000 ewres=20000 w=1474000
> n=1626000 e=1760000 s=1383000
> GRASS 7.8.2 (S4AHomolosine):~ > r.to.vect type=point
> input=soil_map_rcl_no_water output=soil_map_rcl_no_water --overwrite
> WARNING: Vector map <soil_map_rcl_no_water> already exists and will be
>          overwritten
> Extracting points...
> 100%
> Building topology for vector map <soil_map_rcl_no_water at MAL>...
> Registering primitives...
> r.to.vect complete.
> GRASS 7.8.2 (S4AHomolosine):~ > v.info soil_map_rcl_no_water
>
> +----------------------------------------------------------------------------+
> | Name:
> soil_map_rcl_no_water                                     |
> | Mapset:
> MAL                                                       |
> | Location:
> S4AHomolosine                                             |
> | Database:
> /home/duque004/Work/GRASSDATA                             |
> |
> Title:                                                                     |
> | Map scale:
> 1:1                                                       |
> | Name of creator:
> duque004                                                  |
> |
> Organization:                                                              |
> | Source date:     Fri Apr 16 10:10:31
> 2021                                  |
> | Timestamp (first layer):
> none                                              |
>
> |----------------------------------------------------------------------------|
> | Map format:
> native                                                    |
>
> |----------------------------------------------------------------------------|
> |   Type of map: vector (level:
> 2)                                           |
> |
> |
> |   Number of points:       114             Number of centroids:
> 0          |
> |   Number of lines:        0               Number of boundaries:
> 0          |
> |   Number of areas:        0               Number of islands:
> 0          |
> |
> |
> |   Map is 3D:
> No                                               |
> |   Number of dblinks:
> 1                                                |
> |
> |
> |   Projection:
> unknown                                                      |
> |
> |
> |               N:           1615875    S:
> 1393125                 |
> |               E:  1749785.71428571    W:
> 1484214.28571429                 |
> |
> |
> |   Digitization threshold:
> 0                                                |
> |
> Comment:                                                                 |
> |
> |
>
> +----------------------------------------------------------------------------+
>
> GRASS 7.8.2 (S4AHomolosine):~ > g.region nsres=100 ewres=100 w=1474000
> n=1626000 e=1760000 s=1383000
> GRASS 7.8.2 (S4AHomolosine):~ > v.surf.idw npoints=1
> input=soil_map_rcl_no_water output=soil_map_rcl_water_fill --overwrite
> Input vector map <soil_map_rcl_no_water at MAL> is 2D - using categories to
> interpolate
> WARNING: No record for point (cat = 1)
> WARNING: No record for point (cat = 2)
> WARNING: No record for point (cat = 3)
> WARNING: No record for point (cat = 4)
> WARNING: No record for point (cat = 5)
> WARNING: No record for point (cat = 6)
> WARNING: No record for point (cat = 7)
> WARNING: No record for point (cat = 8)
> WARNING: No record for point (cat = 9)
> WARNING: No record for point (cat = 10)
> WARNING: No record for point (cat = 11)
> WARNING: No record for point (cat = 12)
> WARNING: No record for point (cat = 13)
> WARNING: No record for point (cat = 14)
> WARNING: No record for point (cat = 15)
> WARNING: No record for point (cat = 16)
> WARNING: No record for point (cat = 17)
> WARNING: No record for point (cat = 18)
> WARNING: No record for point (cat = 19)
> WARNING: No record for point (cat = 20)
> WARNING: No record for point (cat = 21)
> WARNING: No record for point (cat = 22)
> WARNING: No record for point (cat = 23)
> WARNING: No record for point (cat = 24)
> WARNING: No record for point (cat = 25)
> WARNING: No record for point (cat = 26)
> WARNING: No record for point (cat = 27)
> WARNING: No record for point (cat = 28)
> WARNING: No record for point (cat = 29)
> WARNING: No record for point (cat = 30)
> WARNING: No record for point (cat = 31)
> WARNING: No record for point (cat = 32)
> WARNING: No record for point (cat = 33)
> WARNING: No record for point (cat = 34)
> WARNING: No record for point (cat = 35)
> WARNING: No record for point (cat = 36)
> WARNING: No record for point (cat = 37)
> WARNING: No record for point (cat = 38)
> WARNING: No record for point (cat = 39)
> WARNING: No record for point (cat = 40)
> WARNING: No record for point (cat = 41)
> WARNING: No record for point (cat = 42)
> WARNING: No record for point (cat = 43)
> WARNING: No record for point (cat = 44)
> WARNING: No record for point (cat = 45)
> WARNING: No record for point (cat = 46)
> WARNING: No record for point (cat = 47)
> WARNING: No record for point (cat = 48)
> WARNING: No record for point (cat = 49)
> WARNING: No record for point (cat = 50)
> WARNING: No record for point (cat = 51)
> WARNING: No record for point (cat = 52)
> WARNING: No record for point (cat = 53)
> WARNING: No record for point (cat = 54)
> WARNING: No record for point (cat = 55)
> WARNING: No record for point (cat = 56)
> WARNING: No record for point (cat = 57)
> WARNING: No record for point (cat = 58)
> WARNING: No record for point (cat = 59)
> WARNING: No record for point (cat = 60)
> WARNING: No record for point (cat = 61)
> WARNING: No record for point (cat = 62)
> WARNING: No record for point (cat = 63)
> WARNING: No record for point (cat = 64)
> WARNING: No record for point (cat = 65)
> WARNING: No record for point (cat = 66)
> WARNING: No record for point (cat = 67)
> WARNING: No record for point (cat = 68)
> WARNING: No record for point (cat = 69)
> WARNING: No record for point (cat = 70)
> WARNING: No record for point (cat = 71)
> WARNING: No record for point (cat = 72)
> WARNING: No record for point (cat = 73)
> WARNING: No record for point (cat = 74)
> WARNING: No record for point (cat = 75)
> WARNING: No record for point (cat = 76)
> WARNING: No record for point (cat = 77)
> WARNING: No record for point (cat = 78)
> WARNING: No record for point (cat = 79)
> WARNING: No record for point (cat = 80)
> WARNING: No record for point (cat = 81)
> WARNING: No record for point (cat = 82)
> WARNING: No record for point (cat = 83)
> WARNING: No record for point (cat = 84)
> WARNING: No record for point (cat = 85)
> WARNING: No record for point (cat = 86)
> WARNING: No record for point (cat = 87)
> WARNING: No record for point (cat = 88)
> WARNING: No record for point (cat = 89)
> WARNING: No record for point (cat = 90)
> WARNING: No record for point (cat = 91)
> WARNING: No record for point (cat = 92)
> WARNING: No record for point (cat = 93)
> WARNING: No record for point (cat = 94)
> WARNING: No record for point (cat = 95)
> WARNING: No record for point (cat = 96)
> WARNING: No record for point (cat = 97)
> WARNING: No record for point (cat = 98)
> WARNING: No record for point (cat = 99)
> WARNING: No record for point (cat = 100)
> WARNING: No record for point (cat = 101)
> WARNING: No record for point (cat = 102)
> WARNING: No record for point (cat = 103)
> WARNING: No record for point (cat = 104)
> WARNING: No record for point (cat = 105)
> WARNING: No record for point (cat = 106)
> WARNING: No record for point (cat = 107)
> WARNING: No record for point (cat = 108)
> WARNING: No record for point (cat = 109)
> WARNING: No record for point (cat = 110)
> WARNING: No record for point (cat = 111)
> WARNING: No record for point (cat = 112)
> WARNING: No record for point (cat = 113)
> WARNING: No record for point (cat = 114)
> 0 points loaded
> ERROR: No points found
>
>
>
> --
> Luís
>
> Sent with ProtonMail <https://protonmail.com> Secure Email.
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/grass-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20210416/92e14743/attachment-0001.html>

More information about the grass-user mailing list