Starting with Postgres / Postgis

PostgreSQL’s general documentation is excellent, and very abundant, but
for QGis users (and perhaps ArcGis users) it’s hard to find a trivial document
explaining how to install Postgres and then Postgis , so as to have an operational
database in a few minutes. How to envisage the  possibilities and functioning of the pair
Postgis / QGis without going through extensive training. Of course, once this
superficial trick is over, you will be able to tackle the reading of the
official documentation and learn how to manage or develop with Postgres.
This   Article aims to:

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Dimension Explorer: User’s Guide

In a previous article ( Dimension Explorer in ArcGis 10.3: From Time Cursor to Multidimensional Cursor ) we started the Dimension Explorer 1.1 User’s Guide.

Here is the last part of this article.

How to record and reopen three-dimensional models

By using the “Save / Open” panel you can save and reopen dimensional models in the current document. To save the current dimensional model, enter a name in the text box and click the “Save” button . Be sure to save the document (.mxd) before closing ArcMap. Templates are saved in the .mxd file . To re-open a saved dimensional model, simply select it from the list.

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Understanding the WMS and WFS geoservices (Part 2)

GetCapabilities

The GetCapabilities operation is a request to a WFS server for a list of operations and services, or capabilities, supported by that server. When you establish a connection with QGis, for example, on a WFS server, QGis sends this request to be able to manage the connection and offer you the uploading of the different available layers.

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Understanding the WMS and WFS geoservices (Part 1)

A geoservice is a way to make geographic information available through the Internet.

Today, almost all products allowing the setting and use of a geoservice are based on the OGC standards. The Open Geospatial Consortium, or OGC , is an international non-profit organization founded in 1994 to address issues of interoperability of geographic information systems (GIS). The purpose of this consortium is to bring together all the stakeholders concerned in the development and promotion of the open standards guaranteeing interoperability in the field of geomatics and geographic information and to foster cooperation between developers, suppliers and users.

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All you have to know to format an Excel table for ArcGis

ArcGis reads straight through the Excel tables. You can add a table to ArcMap, import a table into a geodatabase, or create a join or relationship between an Arcgis layer and an Excel table. Yes but … If you do not know how to pre-format your table, you open a Pandora’s box!

Here, in detail, all you need to know to work in peace and quiet.

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How to change your geometries automatically in relation to a QGis 2.12 reference

One of the recurrent problems regarding the management of the geographical layers results from the differences between the layer entities, depending on their origin . The same layer produced by two different sources will have slight digitalisation differences. But the term  “slight ” does not apply only to our visual perception . In the case of our GIS software , two entities with some shifted points , are as different as two entities located at the antipodes.

The usual solution is to take a layer as reference and applying spatial analysis operators to recover quite poorly the attributes of the other ” similar ” layers .

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Using Adobe Acrobat Reader DC with a Geographic PDF file created with ArcGis (Part 2)

Overlay Layer

[ caption id = “attachment_2729″ align = ” aligncenter ” width = “353”]  

Overlay layer [ / caption]

Using this layer you control which layers are displayed in the main window. You find two types of overlay layers:

  • layers produced directly from the layers and which  depict the same name as in the ArcMap project

layers produced automatically (background, grid , other, …) by the ArcMap PDF generation module  

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Using Adobe Acrobat Reader DC with a Geographic PDF file created with ArcGis (Part 1)

We have already discussed how to use Adobe Acrobat Reader for geographic data visualization ( How to create a Geographic PDF file with ArcGis ). Since the new version of this software has provided some major changes , here is a new article devoted to the use of Adobe Acrobat Reader DC.

You can download this version using the following link https://get.adobe.com/fr/reader/

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QGis 2.12 Innovation: reduce the size of your pdf

When you create print composer output pdf, the vector layers are converted in pdf by using all points present in the layer entities. If you use of bulky layers, this results in large size pdf. In QGis version 2.12 you have a new option that allows you to settle this problem . Let’s consider as example the  Geofla Commons  layer. To appreciate the difference we will not charge anything else . We open the print composer:  

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