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.

Continue reading “Understanding the WMS and WFS geoservices (Part 2)”

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.

Continue reading “Understanding the WMS and WFS geoservices (Part 1)”

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.

Continue reading “All you have to know to format an Excel table for ArcGis”

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 .

Continue reading “How to change your geometries automatically in relation to a QGis 2.12 reference”

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  

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

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/

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

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:  

Continue reading “QGis 2.12 Innovation: reduce the size of your pdf”

Conditional formatting of attribute tables with QGis 2.12

Following innovations introduced by QGis version 2.12 : as in Excel tables, now you can control the cells setting of the attribute table of a layer . Now you can apply conditional rules on the format implementation of the attribute table. To this end , open the attribute table of a layer . On the right, you will see a new button for the conditional setting.

Continue reading “Conditional formatting of attribute tables with QGis 2.12”

How to integrate DWG data in QGis

The DWG format is an Autocad proprietary binary format. When we want to load layers in QGis from this format, multiple problems arise.

QGis uses the GDAL library to read / write external formats , such as DWG.

Firstly a clarification: do not confuse the DWG format and DXF format. Often references for DWG / DXF format are found which is a misuse of language. Both formats are different . The DWG format is the native format for Autocad software. It is a proprietary format and, in theory, subject to license. The DXF format is a data export format for Autocad software. It is public and not subject to license.

Continue reading “How to integrate DWG data in QGis”