Re: [GRASS-user] Export of large vector grid

Thanks Nikos, Did exacly that about 2 hours after posting this question. Interesting that the QGIS app works better than the v.out.ogr in Grass. Surely they both use the same library to write shapefiles? Wes >>> Nikos Alexandris 07/24/09 6:02 PM >>> >>> Wesley Ro

[GRASS-user] Export of large vector grid

=TEST_GRID layer=1 format=ESRI_Shapefile I am pretty sure all is well but cant understand why the vector fails to export. Is it possible to use another format, or is shapefile the best to use? Many thanks and kind regards, Wesley Wesley Roberts MSc. Researcher: Earth Observation Natural Resou

Re: [GRASS-user] Calculating eigen valuesand%varianceexplainedafter PCA analysis

>>> Nikos Alexandris 03/03/09 9:04 AM >>> Wesley: > I got the svn grass6_devel code from the location you suggested and have > now installed but with lots of errors. Here is the output from the > 'make' command (see below the lapack.h error). I understand that I need > to cd into the directory whe

Re: [GRASS-user] Calculating eigen values and%varianceexplainedafter PCA analysis

Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the Environment CSIR Tel: +27 (21) 888-2490 Fax: +27 (21) 888-2693 "To know the road ahead, ask those coming back." - Chinese proverb >>> Nikos Alexandris 03/02/09 5:02 PM >>> On Mo

Re: [GRASS-user] Calculating eigen values and %varianceexplainedafter PCA analysis

Hi Hamish, I would like to check out the new i.pca module described below in the svn repository. Where can I find devbr6 (6.5svn)? So far I have only been able to find 6.4svn. Many thanks, Wesley Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the

Re: [GRASS-user] Calculating eigen values and %varianceexplainedafter PCA analysis

if my knowledge above is correct. Many thanks, Wesley Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the Environment CSIR Tel: +27 (21) 888-2490 Fax: +27 (21) 888-2693 "To know the road ahead, ask those coming back." - Chinese proverb >>>

Re: [GRASS-user] Calculating eigen values and % varianceexplainedafter PCA analysis

64916550 0.00 W 1.2760231622 0.00 Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the Environment CSIR Tel: +27 (21) 888-2490 Fax: +27 (21) 888-2693 "To know the road ahead, ask those coming back." - Chinese p

[GRASS-user] compile grass6.4 problem with tcl.h

Dear Colleagues While trying to compile grass version 6.4.0RC3 I have come across a problem with locating Tcl.h. Here is my install command wrobe...@wroberts-desktop:/usr/local/src/grass-6.4.0RC3$ sudo CFLAGS="-g -Wall" ./configure --with-cxx --with-postgres --with-mysql --with-sqlite --with-

Re: [GRASS-user] Calculating eigen values and % variance explainedafter PCA analysis

I will download and compile 6.4 from source and give the addon a go. Will get back to on the outcome. Installed Fort77 and f2c as per your suggestion. Many thanks, Wesley >>> Nikos Alexandris 02/25/09 3:31 PM >>> >>> Wesley: > I see that I would need to upgrade to 6.4 using svn. I currently

Re: [GRASS-user] Calculating eigen values and % variance explained after PCA analysis

Thanks Hamish, I see that I would need to upgrade to 6.4 using svn. I currently install using synaptic, does this mean I need to compile from source and then add the m.eigensystem addon? Not sure about f77, is this a fortran compiler? I have gfortran compiler version 4.2.3, will this do? Than

[GRASS-user] Calculating eigen values and % variance explained after PCA analysis

in my PCA analysis. Is it possible to calculate the eigen values and % variance explained using GRASS or should I use something like R? I am using version 6.3 on ubuntu hardy heron. Many thanks for your help. Wesley Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural

Re: [GRASS-user] Invert values of raster image

Thanks Moritz, r.recode did exactly what I needed. much appreciated Wes >>> Moritz Lennert 02/23/09 1:02 PM >>> On 23/02/09 11:16, Wesley Roberts wrote: > Dear list. > > I have a raster file with values coded in 8 bit grey scale 0-255. I > would like to invert th

[GRASS-user] Invert values of raster image

Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the Environment CSIR Tel: +27 (21) 888-2490 Fax: +27 (21) 888-2693 "To know the road ahead, ask those coming back." - Chinese proverb -- This message is subject to the CSIR's copyright terms and con

[GRASS-user] Appropriate use of v.surf.rst (lidar data)

http://www.flickr.com/photos/35273...@n07/3270904761/ Many thanks for taking the time to read my post and for your valuable contributions Wesley (I am using Grass 6.3.0 on Ubuntu Hardy Heron) Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the Environment CSIR Tel: +27 (21

Re: [GRASS-user] v.select question

>>> Hamish <[EMAIL PROTECTED]> 09/09/08 3:04 PM >>> Wesley wrote: > I have a question regarding v.select. My data consists of > vector polygons and sample plots randomly positioned both > inside and outside the vector polygons. I would like to > select only those sample plots that are within the ve

[GRASS-user] v.select question

Dear Grass'ers I have a question regarding v.select. My data consists of vector polygons and sample plots randomly positioned both inside and outside the vector polygons. I would like to select only those sample plots that are within the vector polygons, unfortunately v.select selects those sam

[GRASS-user] Speeding up bash script

Dear Grass'ers I have written a bash script to extract the maximum LiDAR height value within a predefined sample site (Vector with 314 sample locations each 10m squared). The script is below. Essentially I use v.extract to select one of my 314 sample sites (Flight_sample2). This temporary vecto

[GRASS-user] v.db.addcol error

Hallo Grass'ers I am having trouble with v.db.addcol. My vector has 315 discrete polygons (sample plots for LiDAR and MX data). I would like to add a column and populate it with numbers running from 1 - 315. db.connect -p returns the following data

[GRASS-user] v.variogram: maxdist and nlag

based on maxdist and nlags, how does one manage this to effectively quantify the distance at which spatial auto-correlation no longer applies? I hope this all makes sense and that the question is appropriate for this mailing list. Many thanks and looking forward to your responses. Wesley

[GRASS-user] Re: Cat problem with v.db.join

Does anyone have a protocol or method to use when joining a the tables from two vectors currently residing in the same mapset? As always, many thanks for your help Wesley >>> Wesley Roberts 06/25/08 3:57 PM >>> Dear User list, I am having some trouble with v.db.join. I have 13

[GRASS-user] image to image registration

Hi All, I have a mosaiced digital aerial photograph data set and an orthorecitifed and atmospherically corrected Ikonos data set of the same area. I would like to register the Ikonos data (4m res) to the digital aerial photography (1m res). Is this task possible in Grass? If not could could som

[GRASS-user] Cat problem with v.db.join

Dear User list, I am having some trouble with v.db.join. I have 13 point vector files with tables connected and created using sqlite. I copy one of the files and rename it AnalysisData I would now like to use v.db.join to join all of my 13 files to AnalysisData. All 13 files have the same num

Re: [GRASS-user] Vector dbf files + Spatial join

. Do I need to uninstall 6.2.3 before I compile? Also I found the v.db.join script at http://trac.osgeo.org/grass/browser/grass/branches/develbranch_6/scripts Can I use this script in 6.2.3? If so how do I go about compiling and using? Many thanks, Wesley Wesley Roberts MSc. Researcher: Forest

Re: [GRASS-user] Vector dbf files + Spatial join

Many thanks, Wesley Wesley Roberts MSc. Researcher: Forest Assessment (Remote Sensing & GIS) Forestry and Forest Products Research Centre CSIR Tel: +27 (31) 242-2353 Fax: +27 (31) 261-1216 http://ffp.csir.co.za/ "To know the road ahead, ask those coming back." - Chinese proverb -- This

[GRASS-user] Vector dbf files + Spatial join

point me towards a GRASS orientated mySQL tutorial Many thanks, Wesley Wesley Roberts MSc. Researcher: Forest Assessment (Remote Sensing & GIS) Forestry and Forest Products Research Centre CSIR Tel: +27 (31) 242-2353 Fax: +27 (31) 261-1216 http://ffp.csir.co.za/ "To know the road ahead,

[GRASS-user] Raster to vector conversions

look at the relationships between LiDAR height metrics and Ikonos reflectance. I know I can use v.patch to combine them all but I am yet to get the raster values into a point data set where each point represents one pixel in the image? Many thanks Wesley Wesley Roberts MSc. Researcher

Re: [GRASS-user] v.rast.stats and Lidar data

0.231914 -73001.800 -3302078.460 1023.450 0.0 1022.9335327148 0.516467 -73006.690 -3302075.130 1024.060 0.0 1023.5599365234 0.500063 -73000.920 -3302020.790 1033.830 0.0 1033.3255615234 0.504438 -73008.000 -3302019.730 1034.740 0.0 1034.205078125 0.534922 Many thanks for your help. Wesley Wes

[GRASS-user] v.rast.stats and Lidar data

uggestions. Regards, Wesley Wesley Roberts MSc. Researcher: Forest Assessment (Remote Sensing & GIS) Forestry and Forest Products Research Centre CSIR Tel: +27 (31) 242-2353 Fax: +27 (31) 261-1216 http://ffp.csir.co.za/ "To know the road ahead, ask those coming back." - Chinese prov