Digital Geography

OpenSource QGIS + PostGIS installation: “the Windows way”

A short time ago I’ve posted an article on the installation of QGIS in combination with a PostGIS database in the background. As we all know, Windows is mostly used as OS on a PC so this is the Windowized version. This is a short summary that sums up the article of a site called Boston GIS. I’ll show you how to install QGIS version 1.8 (which will be updated in some days) and PostgreSQL with PostGIS extension and show you the first steps in the import of shapefiles and raster data.

How to make a simple topographic map in ArcGIS 9.3.1. Part 1.

So, we all know how a topographical map looks like. On a topographic map, we see different objects, which are indicated by different symbols. For example, we see the elevation marks, vegetation, settlements and so on. But how to make topographic map itself? It is in this article, you will learn how to make a simple topographic map. All we need is a digital elevation model and ArcGIS (I use ArcGIS 9.3.1). Our map will display terrain and elevation marks (contours). As a digital elevation model I will ASTER GDEM v.2. But there are other digital terrain models, such as…

ArcGIS tutorial 2: the ModelBuilder

ArcGIS is a geographic-information-system (GIS) developed by ESRI. Being widely used and the sheer amount of functions and add-ons are maybe the important causes for being a big-player at universities as well. Therefore we will present you some basic tutorials for learning and enjoying ArcGIS: Tutorial 1: ArcGIS tutorial 1: how to georeference a map?! Tutorial 2: the ModelBuilder objective Create a model with the ModelBuilder to automate different workflows in ArcGIS. Therefore we will connect input-data with different tools in a model diagram. what do you need ArcGIS 9 or 10 time effort depends on model complexity. minimal 10mins

create and edit shapefiles with Python only

Some days ago I’ve presented a way to load and monitor the content of a shapefile using pyshp. But since then I was remembering my work with shapefiles in my basic R-seminars and the way we have used the gdal-library for our data management. So I searched the web and found comparable solutions for the project “where are your customers” in Python. You was probably using open source solutions already or are a user of ArcGIS and was frickling around with the Python-interface (new in ArcGIS since version 10). I would like to show you here some basic steps to…