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.
A geoservice is a way to make geographic information available through
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
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.
One of the recurrent problems regarding the management of the geographical layers
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
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
and applying spatial analysis operators to recover
poorly the attributes of the other ” similar ” layers .
We have already discussed how to use
Acrobat Reader for geographic data visualization ( How
to createaGeographic PDF file with
ArcGis ). Since the new version of this
major changes , here is a new article devoted to the use of Adobe
Acrobat Reader DC.
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:
Following innovations introduced by QGis version
2.12 : as in Excel tables, now
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.
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.
is a proprietary format and, in theory,
subject to license. The DXF format is a data
export format for Autocad software.
public and not subject to license.