Integrated Coastal Management: location (spaces) and localization (space)

Unlike in a previous article (Spatial Data Analysis and Spatial Analysis of Data) where nothing was specific to coastal management, in this article I will examine specifically Coastal Management. We will start by discussing how geomatics applied to the littoral zone displays very specific features.


Continue reading “Integrated Coastal Management: location (spaces) and localization (space)”

QField: the mobile device of QGis for Android

QField allows you to do fieldwork on QGis projects with Android phones or tablets.
In this article we will discuss how to install QField on a mobile device and how to install and work on a QGis project. Continue reading “QField: the mobile device of QGis for Android”

How to create a SpatiaLite database with QGis

If you start to feel tired of managing your data as shape files (this format dates back to the eighties!) and you yearn for a genuine database for your projects, most certainly, you will be looking to use PostGis. There is a big gap, and the ‘jump’ is, by no means, an easy one. In this article, we will discuss an alternative solution, the SpatiaLite database. And, believe me, it is much more easier…. Continue reading “How to create a SpatiaLite database with QGis”

How to rectify the geometry of a Postgis table

We have already discussed the topic of geometry validation through a series of articles (in french):

In this article we will discuss, in detail, how to detect and rectify geometric problems in a PostgreSQL / Postgis table using SQL queries.
Continue reading “How to rectify the geometry of a Postgis table”

Start with PostgreSQL / Postgis -Introduction to pgAdmin 4

Following up a previous article (Débuter avec Postgres/Postgis ), we will address an introduction to Postgres/postgis database management. We will load a shapefile, connect and load the Postgis layer from QGis.

The most  suitable method to manage PostgreSQL databases is by using the pgAdmin4 GUI.

This tool is setup automatically during PostgreSQL installation. You can launch it from the programme bar:

Continue reading “Start with PostgreSQL / Postgis -Introduction to pgAdmin 4”

Geoserver avanzado: el teselado (puesta en práctica)

En el artículo anterior (Geoserver avanzado: las teselas (principios)) vimos los diferentes conceptos para el teselado de mapas.

En este artículo veremos cómo implementar estas funciones en Geoserver. Continue reading “Geoserver avanzado: el teselado (puesta en práctica)”

Advanced Geoserver : tiling (quick start)

In the previous article (Advanced Geoserver: tiling (principles) we have explored the different concepts regarding the tiling mapping.
In this article we will discuss how to implement those applications using Geoserver.
In order to run the tiling, Geoserver uses an external module called GeoWebCache. Continue reading “Advanced Geoserver : tiling (quick start)”

Use of Landsat images (free) in your GIS

When we think of accessible data to integrate into our GIS, we hardly think of satellite data. And yet, it is possible, and just a few clicks away.

Let’s see an example. The following images represent the state of the vegetation for the islands of the Gulf of Morbihan, on the left for July 2014, on the right for March 2015. If we wish, we can obtain images every 15 days, the most just one week old.

ndvi juillet morbihan

ndvi mars morbihan

Findin, recovering and processing them in just 5 minutes. So, why deprive yourself?  Continue reading “Use of Landsat images (free) in your GIS”

How to join data from Excel to an attribute table in QGis

The present topic is meant as a brief review since the possibility of loading and attach Excel tables was introduced by QGis 1.8.
As we do not follow the general logic, for new users it is not easy to find the answer. So, step by step, how to make a join between a spatial layer (we’ll take an example here with a shapefile) and a non-spatial table like Excel (with or without XY fields). Continue reading “How to join data from Excel to an attribute table in QGis”