Hot answers tagged free-software
9
A great GIS that has a huge amount of functionality is QGIS. It is very easy to install especially if you use the osgeo4w installer (Windows). You can use it to view your GML file too.
OSGeo is the place you want to look for OpenSource (free) GIS tools and libraries: http://www.osgeo.org/. You will find a ton of stuff here plus links to QGIS and other ...
8
There are lots of free GIS tools available. One of the imho best is QuantumGIS: http://www.qgis.org. It is available for win/mac and linux.
But maybe you prefer openjump a tool written in java, which has special strengths in editing, topology-checking: http://www.openjump.org/
Also take a look at: http://freegis.org/
7
Maybe these links will help you:
How to build effective heat-maps?
with QGIS: http://alexsciuto.com/blog/2010/11/how-to-make-your-own-heat-map-pt-1-gathering-the-materials/
Python script: http://www.sethoscope.net/heatmap/
http://sk53-osm.blogspot.com/2011/01/heat-maps-from-osm-pois.html
Sorry for a non elaborated answer..
6
Refractions Research has made a Line Cleaner tool that seems to do what you want.
Line Cleaner cleanses networks by simplifying complex, cyclical, very
short and zero-length geometries, and removing pseudo-nodes and
insignificant vertexes. Most significantly, in the cleansing phase, it
is able to ensure that feature matches can be considered ...
6
Most of these recommendations are not open-source, but they are free and add a lot of useful functionality to ArcMap.
Geospatial Modeling Environment - Written for ArcView (works with all licenses though), adds some functionality that is available in ArcEditor and ArcInfo. Not open-source (uses R, which is open-source though), but free.
ET Tools (GeoTools, ...
5
Draftsight
http://www.3ds.com/products/draftsight/draftsight-overview/
or even better
DoubleCAD
http://www.doublecad.com/Products/DoubleCADXTv3/tabid/1100/Default.aspx
5
Hossein, combining spatial maps with databases is the heart of GIS. Practically any GIS will allow you to do both of those things in a variety of ways - though a desktop interface, programatically, served remotely, etc. Here is an excellent list of free and open source desktop GIS packages. Quantum GIS, with a powerful collection of tool and an easy-to-use ...
5
Did you try Qgis? I think wil cover you. You wil find a lot of help on Internet. It is very easy to manipulate the data. If you want to change their style or icons it is very easy. And of course Tiff export is a standard. Is open source and cross platform, that mean you can install it in any Opereting System.
More info:
From here
Download:
From here ...
5
Here's one possible solution:
Digitize the features in QGIS (which is free software)
Use SQL Server 2008 Spatial Tools (free), Shape2SQL in particular, to import your resulting shapefile(s) you created in QGIS into SQL Server
Some Googling or searching on this site will get you links to other QGIS tutorials on digitizing and just using QGIS in general.
4
Here a generic soluion, that you can impĺement with PostGIS or any other OGC-compliant software.
NOTE: as I say before, a key concept in FOSS and GIS is standardization: the best solutions adopt standards, like OGC ones.
Your problem is to "find pseudo nodes"... But I think that it is a little more, "find non-pseudo nodes and join lines of pseudo ...
3
The OpenStreetMap (OSM) editor JOSM is a great tool for digitising. Although it is specifically developed for editing data in OSM it can save data as .osm or GeoJSON files which can then be converted to other GIS formats (e.g. using ogr2ogr). This export facility converts it into a good general purpose digitising package.
3
You could take a look at Sextante which makes SAGA and GRASS functionality available through ArcGIS 10. You can also install SAGA separately and run it from ArcGIS using the command line. Both give you alternatives to a lot of Spatial Analyst type features.
3
You might want to try Orfeo Toolbox.
OTB is based on the medical image processing library ITK and offers
particular functionalities for remote sensing image processing in
general and for high spatial resolution images in particular. Targeted
algorithms for high resolution optical images (SPOT, Quickbird,
Worldview, Landsat, Ikonos), hyperspectral ...
3
GRASS GIS can do the same job: http://grass.osgeo.org
3D tutorial
volume calculation: r.volume
nviz visualization tool:
3
Keep in mind - no one procedure is necessarily going to provide the "best result." Image interpretation is critical, both before and after classification. You will likely find urban areas misclassified as something else and non-urban areas classified as being urban.
You have two basic approaches:
1) Supervised classification: this involves selecting ...
2
You can have a look in GvSIG (OADE version), it starts to have good build-in tools for CAD, so :
it has a command line tools to edit every points (with some topology functions)
it opens .dwg, .dxf and .dgn files
it generates world files for raster georeferencing
it integrates like Kosmo, Sextante and now Grass for the OADE version so you can make profile
...
2
I've never tried it, but here is mention of sketchup on linux.
You can place a sketchup model into google earth.
2
I'm assuming you want a density map of how "well covered" each area is, i.e. how many offices it is near, incorporating the "radius" of those offices?
You can actually do all this within PostgreSQL, or at least within PostGIS, which is a free extension. I suggest you get hold of that, and read up on some of the docs.
You will probably then need to geocode ...
2
You can download city data from Natural Earth Data site:
Populated Places
Raster maps you can use as a background
You can use all files from that site with QGIS but any other open source GIS should be fine.
There are many possible ways to navigate to a given city. For example, QGIS "Find by attribute" plugin lets you search for a city by it's name and ...
2
I just thought of a fairly simple solution, which assumes the comment I posted on the question is correct:
It sounds to me like every single paved street must be connected in a single network. Any paved street not connected to that network must have been mistakenly given the "paved" attribute.
If so, in ArcGIS you can use the Dissolve tool, dissolving ...
2
It isn't very fancy, but depending on how your line data is drawn it may work:
1) Use the Unsplit Line tool on your road file and have your dissolve field be your paved/unpaved field in your table. This means you will have one large object representing the connected paved roads.
2) Select all paved roads in the new file.
3) Manually remove the large object ...
2
While ArcGIS can certainly perform the work you want, if you have access to other software, I would use those. I have not used GRASS before for image classification, but I know it is more than capable. From my knowledge, Ecognition is more for object based classification. I have used ENVI for image classification a few years ago and it does the job really ...
2
Let's narrow down the methods of classification to two major groups: object-oriented classification and pixel-based classification. The attached tables are from a publication titled Comparison of Pixel-Based and Object-Oriented Classification Approaches using Landsat-7 ETM sPECTRAL Bands. The highlighted row in Table 3 shows that object-oriented ...
1
In GRASS GIS, you can use v.edit for this. There is " snap: Snap vector features in given threshold" along with the possibility to define a box or polygon to spatially constrain the snapping to a certain area in the map as well as "where" to constrain with attribute selection.
1
Here are steps to Find your pseudo nodes using OpenJump a free GIS.
QGIS and gvSIG have the Sextante Plugin, so these same steps should work their too,
the Spatial Join might be slightly different.
I used version 1.2 for testing.
-- save the Line endpoints
Sextante toolbox, Topology, Extract endpoints of lines -> endpt_0
-- unsplit your lines
Sextante ...
1
Also, if you do not mind some scripting in Python, there is Shapefile module for this.
Small example, create .shp with point features from coords in .xls:
import xlrd
import shapefile
Path = "c:/"
f = "Excel_w_coords.xls"
# Open Excel workbook
wb = xlrd.open_workbook(Path + f)
# List all sheets in Excel
list = wb.sheet_names()
for i in list:
sh ...
1
You can do this simply online by using Mapsdata.co.uk
The app reads data from .xls or .csv and is pre-programmed to convert geo-data such as the UK Postcodes. You could do several visuals: one could be a bubble map using the catchment area as a value, pins with opacity to show density, or a heatmap. In all options, you can change the opacity, color, etc ...
1
MapMaker Pro will export
Excel spreadsheet
As with DBF files you can import an Excel spreadsheet if it has columns for the coordinates.
Note to import Access or Excel data you need Microsoft ADO, ADOX, and Jet Engine
4.0 installed.
Export files
Remember that in Map Maker information on the appearance of styles is not stored in
the vector file but is ...
1
SAGA GIS also provides "simple region growing", "fast region growing" and "watershed segmentation". The documentation is not available but I will prepare a video tutorial for my students in the next days. I will post here if ready.
download for SAGA GIS is here:
http://sourceforge.net/projects/saga-gis/files/SAGA%20-%202.0/
2.08 is a stable older version
...
1
The procedure is mostly the same for all softwares. You need a base surface, where it contains the heights of the terrain representing it now, and a future surface, representing how the terrain must look like after work.
The software makes a difference in them and retrieves the results in a graphic form. ArcGIS 3d Analyst does that job. I'm not sure of ...
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