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Calculating bioclim variables in GRASS GIS

A script is provided to calculate Bioclim variables in GRASS GIS on Linux using monthly temperature and rainfall data. Continue reading →

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QGIS 1.4.0 released

Release QGIS 1.4.0 'Enceladus' Continue reading →

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A map of Madidi National Park

See The grunts of the jaguar on Forestalis for a nice story by Jeroen van der Horst about his trip in Madidi National Park in Bolivia. I had no clue where to find this park so decided to look it …...

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Importing WorldClim climate .bil datalayers in GRASS GIS

In a previous post I wrote how you can generate bioclimatic data layers based on monthly rainfall and temperature data in GRASS GIS. Monthly climate data for future conditions can be downloaded from...

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Sampling raster values at point locations in QGIS

Recently I received an excel file with the coordinates of 144 vegetation sample plots, with the request to get the altitude values for the plots. For those with little experience in GIS, this is easy...

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Making beautiful maps…

Well, in my (admittedly limited) experience, that is actually one of the weaker points of many open source GIS programs. Take for example GRASS or SAGA GIS. Both are very powerful analytical tools, but...

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ESRI rasters in GRASS or QGIS

To exchange data one should preferably use a non-proprietary format, such as the ARC/INFO ASCII GRID or GeoTIFF. Unfortunately, it still happens that data is distributed in a proprietary binary format....

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Extract raster values to vector points using GRASS GIS

One of my more frequently visited posts is about how to extract data at point locations in QGIS (see here). In GRASS GIS this can be done with the ‘Sample raster maps at point location’ function. This...

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ClickFu in QGIS

Although Google maps and other online mapping tools become more powerful, creating and analyzing maps is still typically done using a desktop GIS. I am for example using GRASS GIS and QGIS for my work....

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Adding Google or OpenLayers maps to your Desktop GIS

Although Google maps and other online mapping tools become more powerful, it is not always easy or straithforwards to use these tools to combine offline maps with online maps from e.g., Google or Yahoo...

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Release GRASS 6.4

The GRASS development team just released GRASS GIS 6.4.0, the first in the new line of 6.4 stable releases. Due to the highly conservative stabilization policy of the GRASS development team this is...

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Improved labeling tool in QGIS

I just downloaded and installed the latest version of QGIS, version 1.6. It isn’t officially out yet, but it should be released any time soon now. For the impatient ones, you can download the source...

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How QGIS has grown over the years

Quantum GIS (or in short QGIS) started out as a simple GIS viewer. But it has seen an incredible growth in functionality, especially in the last few years. It is still very simple to use, making it an...

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Creating high resolution geo-referenced maps

Just making a note to myself for when I want to make a high resolution geo-referenced map composed of different input data layers. As described here, one can save an image of the current map(s) in...

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Mapping Forest resource assessment 2010 data – part I

About a year ago I wrote a post about how to make a map showing deforestation rates in Africa based on the Global Forest Assessment 2005 by the Food and Agriculture Organization of the United Nation...

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Mapping Forest resource assessment 2010 data – part II

I am creating a series of maps based on the Global forest resources assessment 2010 (FRA). A first example is the map below with the forest and woodland cover per country as percentage of the total...

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Try out range of geospatial tools the easy way

The main reason I started to use Linux was because at the time it was, and still is I think, much easier and more reliable to run GRASS GIS and other FOSS geospatial tools on Linux. An exception to...

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New spatialite plugin for QGIS

For some time now it is possible to load SpatiaLite data layers in QGIS. It is read only though, any changes will need to be saved as shapefile. There is a Spatialite manager plugin, which offers an...

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On the QGIS wiki: How do I do that in QGIS

On the QGIS wiki there is a great section with the self-explanatory title ‘How do I do that in QGIS‘. To quote from the introduction of this section, “it is intended to show how to perform basic GIS...

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Support the GRASS GIS Community Sprint 2011!

The GRASS GIS core development team is organizing a meeting where a group of developers and users will meet to improve the software, manuals and web site. They are seeking financial support to make...

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Using OGR

One of the reasons I like GRASS GIS is that everything can be done at the command line. Of course there are other ways to do this, and one which I want to explore a bit more is the OGR … Continue...

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Creating a map using the command line

Although I like to carry out GIS analyses using the command line interface (CLI), creating maps is something I still tend to do using the graphical interface (GUI). And most of the time that makes...

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SQLiteMap

Looks interesting, a R package that provides bindings to Spatialite functionalities. Through this bindings one can carry out the spatial functions available in Spatialite from within R using simple SQL...

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Importing global rasters in GRASS gives me ‘illegal latitude for North’ message

Importing data layers with a global coverage in GRASS GIS might in some cases result in the error message “G_set_window(): Illegal latitude for North”. For example, I got the message while trying to...

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Free online textbooks on geospatial and statistical analysis

Geospatial analysis guide I just found, through this blog, a very nice text book on geospatial analysis; Geospatial Analysis – A comprehensive guide by M. de Smith, P. Longley and M. Goodchild. The...

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GRASS GIS: creating cross products of multiple raster map layers

I am looking at vegetation distribution in east Africa, using a map we have developed based on historical vegetation maps from the region, and I wanted to know the surface area per vegetation type per...

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New version of QGIS out

The latest and greatest of QGIS is out, version 1.7. A lot of new functionality and improvements, check out the release notes here or download it directly from here.Filed under: GIS, GIS software, QGIS...

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QGIS Android works! @ GIS and Web Tricks

I haven’t tried this out, but the title of this blog article looks promosing. http://www.bernawebdesign.ch/byteblog/2011/08/21/qgis-android-works-2/Filed under: GIS software Tagged: android, feeds,...

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Linking a lookup table to your vector layer

I was looking for a way to link an attribute table of a vector layer to a look up table, with a one to many relation. As discussed here and here, this does not seem to be possible in QGIS. … Continue...

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Create wld file for map image

It is easy to export a raster file as a georeferenced images with e.g., GRASS, QGIS or gdal. It becomes more complicated if you want to export a map, composed of different layers. In QGIS, you can...

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QGIS Android works! @ GIS and Web Tricks

Seems pretty cool, now all I need is to upgrade my phone to Android 2.3 device because it won’t run on 2.2 or below: http://www.bernawebdesign.ch/byteblog/2011/08/21/qgis-android-works-2/Filed under:...

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QGIS on my android phone

I mentioned before that QGIS was being ported to Android. I couldn’t try it out at the time as my phone was still running on Android 2.2. However, I just managed to upgrade my phone to Android 2.3 and...

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New “Control Rendering Order” Option in QGIS

I just installed the latest QGIS development version (build 1.9.90-Alpha), and one of the changes I noticed was the option “Control rendering order” in the layers pane. I had to Google to check out...

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New library to extract OSM data

A quick note to myself (and whoever is interested ) Markus Neteler mentioned on the GRASS user mailing list a new library that came out that extracts valid data from within an OpenStreetMap input file....

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Integrating Maxent, R and GRASS GIS

The maximum-entropy (Maxent) methods is one of the most widely used approaches for species habitat modelling. It has its own dedicated software, the Maxent software (written in java and therefore...

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Calculating the raster cell area of an unprojected raster layer

What if you get a raster layer with number of people per raster cell, like for example the population layer from Afripop,  and you want to convert it to a population density layer? Well, obviously, you...

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Rescale your raster data layer

Sometimes you want to rescale a raster layer, e.g., to reduce the number of categories, or to create a common scale for different raster layers. Very basic of course, so you can expect to find an...

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Locus Map Pro carries its support for MBTiles to the next level

I wrote before about the MBtiles format, a convenient format to store tiled maps in a single portable sqlite database. Probably the easiest way to create them is with Tilemill, as described here. The...

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Metadata support in GRASS GIS

GRASS GIS always has been lacking proper meta data support. But that has changed with the (relative) new wx.metadata add-on, which includes advanced tools for metadata management according to ISO...

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GRASS GIS 6.4.3 RC4 released

Good news, check it out: http://grass.osgeo.org/news/25/15/GRASS-GIS-6-4-3RC4-released/Filed under: GIS software, GRASS GIS, Software release Tagged: GRASS GIS

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Update of r.forestfrag addon for GRASS GIS 7.0

Riitters et al. (2000) proposed a quick approach to measure the degree of forest fragmentation that could be relatively easily implemented and which only required a map with forest and non-forest....

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QGIS 2.10 Pisa is out!

The new QGIS 2.10 (Pisa) has been released, with many great new features, tweaks and enhancements. Check out the changelog for the highlights (you’ll need some time, it is again an impressive list of...

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Climate data sets, which one to select?

For species or vegetation modelling, one of the first choices to make is the selection of explanatory variables, which in most cases will include climatic or bioclimatic data sets. One of the most...

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Terrain attribute selection in environmental studies

Exploring species-environment relationships is important for amongst others habitat mapping, biogeographical classification, conservation, and management. And it has become easier with (i) the advance...

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Data exploration in GRASS GIS – boxplots

I am currently working on some exercises for which I need data about municipalities in the Netherlands. A good place to look for such data is the CBS (Dutch Central Bureau of Statistics). One data...

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Update release GRASS GIS 7.4.4

For those who missed it, a new update release GRASS GIS 7.4.4 is available since the 4th of January. It mainly brings bugfixes, but it also includes an important new function, the module...

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GRASS GIS 7.6.0 released

After almost 1 year of development the GRASS Development team has released the new stable release GRASS GIS 7.6.0. A big thanks to all developers for their work and dedication! There is a lot to like,...

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