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To state the problem, here is an excerpt of the publication
“Geometer n ° 2087,  December
2011″: The issue of the month “Safety, reliability. Buried networks” by Laurent
Polidori (director of ESGT) and Gille Costa (surveyor) :

Continue reading “Reclassification of networks: some preconceived ideas (Part 1)”

Although R is essentially a set of statisticals, its use has been extended to a number of areas, such as natural language processing. This library possesses also solic tools of spatial analysis, including analysis of the distributions of points and the Bayesian geostatical modelling. It is possible to read and manage a variety of vector and raster data, including shapefiles, NetCDF and GDAL.

Continue reading “Using R in QGis processing”

In a previous article we discussed how to create a layer lines from a file text or Excel with Arcmap . Now is the turn with QGis.There are only two differences :

• the first is that it is not necessary to load the Excel table, and then save it in as a layer (shapefile)
• the second is that there is no option to close automatically the lines by linking the last point to the first point of each line .

Continue reading “Points to Line with QGis”

Since delivery of the 10.3 version, there are some new ArcMap tools available that deserve to be better known . Here is a series of articles regarding their description. Firstly, we will discuss the “Points to line” tool,  You, probably,  know the procedure for integrating a table of points, in text format or Excel, as a layer of points in Arcmap . If this is not the case , it will be described a little further in this article. What is less known is that you can as well incorporate tables containing rows as series of points, such as GPS routes. Let’s see for example a bathymetry layer.   

Continue reading “New ArcMap tools : Points to line”

Following the previous article ( QGis 2.18 is available ) here is a comment that completes and clarifies this article

Author   : Sant-anna

E- mail: delazj@gmail.com

Hello,

Following a closer look at the QGIS project, if I may a few comments :

Continue reading “QGis 2.18: some precisions”

The QGis Las Palmas 2.18 version is available to download .

Click to go to the download page of QGis project.

Continue reading “QGis Las Palmas 2.18”

The Autofields plugin for QGis allows filling automatically the attribute fields of a layer when creating or publishing entities. You can, for example, fill a field with the value of x or y of the point, or the beginning point of a segment, the segment length, etc. You can use this plugin from version 2.12 of QGis and only from version 2.14 if you use the calculations based on the geometry requiring coordinate system transformations.

Continue reading “The Autofields plugin for QGis”

To ensure that everything worked out fine, we will load the new Postgres layer in ArcGIS. Open ArcGis and the Catalog window .  

Continue reading “How to load a Postgres / Postgis layer in ArcMap”

If you import or create svg symbols to use  them in QGis you will notice that the color options as well as the outline of these symbols are disabled in QGis. In fact , these settings are coded in hard in the svg file and , if you want to make them available , you are forced to create as many symbols as colors desired .

Continue reading “How to make an svg symbol editable ( color , stroke ) in QGis”

Even  if it can look weird (use a GIS tool not to update a GIS base) there are occasions when it proves very useful.

A GIS base comprises two types of information : spatial information ( geometry ) and attributes information . For many field projects there is untrained GIS staff responsible for maintaining the information , especially attributes , of a GIS database.

Continue reading “How to update a Postgresql / PostGIS database with LibreOffice”