I am not sure if the context of your question is really on-topic here, but since the answer and its implications is very much relevant for travellers as well, I'll give it a try.
The explanation you have read is not entirely accurate. The problem is that accurate map material is neither allowed to be published, nor to leave the country. The Chinese National ...
Here is a very comprehensive shapefile for Nigeria and provides land-use data in the form of legends in Excel files. There is also an ArcGIS layer for styling as there are 23 different filters (I did this in QGIS so I only added in a few filters manually). Here is the link:
Populated Places 1:10m (Natural Earth) Shapefile
No permission is needed to use Natural Earth. Crediting the authors is
However, if you wish to cite the map ...
You can get Sentinel-1 data from scihub.esa. Requires only
registration (And most likely, non-commercial use). As Sentinel-1
has just become operational the archive is not very extensive but
should grow quite quickly.
You can set request data-access propospal on Alaska Satellite
Facility. Some data open access. For ALOS-PALSAR you must be a resident of the ...
I decided to merge other answers with mine and organize them into a tabular format. I think it is easier to read and manage for future visitors:
The table can be accessed from the following link in csv format:
View in tabular form: Free LiDar DataSources
Download (csv): Free LiDar DataSources
Please submit pull request if you intended to add to this ...
Frank Donnelly provides a CSV file of country centroids that's based on data taken from the GeoNames Server, but hand curated by Frank. The data was last updated in February 2012.
The former source isn't available anymore, here is a newer one, with lots of infos on the countries (incl. Centroids), and possibility to download the data in several ...
You can download the "official" EU administrative/statistical units from Eurostat's GISCO service. The vector layers are available as ESRI Shapefiles and Personal GDBs, at different resolutions from here.
Note, in order to extract the country level polygons as below, you will need to extract all features based on the following query STAT_LEVL_ = 1 from ...
Ordnance Survey's VectorMap District has a shapefile that contains Underground stations - it's within the "RailwayStation" file but you can filter on the "CLASSIFICA" field. The website is http://www.ordnancesurvey.co.uk/oswebsite/products/os-vectormap-district/index.html and the licence is based on the Open Government Licence http://www.ordnancesurvey.co.uk/...
I recommend checking the http://freegisdata.rtwilson.com/ web site which contains a categorised list of links to over 300 sites providing freely available geographic datasets - all ready for loading into a GIS.
To get OSM data or Natural Earth, as Ryan suggested, I recommend checking the http://market.weogeo.com
Another excellent resource with huge amount ...
Your field names seem to be linked to CENSUS data (very similar to this file )
@Map_man answer will lead you to the source of your data, to be sure.
See here some metadata that seem to fit : https://www.arcgis.com/sharing/rest/content/items/ba931cd7a8f341ed9486a41c6f6798d4/info/metadata/metadata.xml?format=default&output=html
Attribute Label: ID
A new format that has come about recently is the Geopackage. This specification is built on top of the SQLite database, so it has the same single-file basis, but with the added benefit of being an OGC standard.
As to file size, it is likely that the storage format is more compact than the .shp and .dbf format for spatial and attribute data used in the ...
I think you will find that the Natural Earth dataset and OpenStreetMap will give you a good start for worldwide base data, in addition to simply searching for questions with the data tag here on our site.
Why use a database?
Because it's not necessarily the case, especially with larger datasets, that you can expect to be able to push the entire thing to the client. If you're talking thousands of points, then sure, but for millions of points you probably don't want each and every one represented in RAM on your end users' client. Not everyone has a super fast ...
It's probably easiest for you to create your own hexagonal grid shapefile. Many GIS have built-in tools for creating hexagonal grids of any desired resolution and orientation. For example, in the cross-platform and open-source GIS Whitebox GAT, for which I am a developer, you can use the Create Hexagonal Vector Grid tool to create a hex-grid shapefile for ...
The EU has a Corine landcover derivative dataset, Urban morphological zones, which gives polygons of urban areas across Europe defined as:
A set of urban areas laying less than 200m apart
The link to download is:
The page also contains detailed information about ...
Briefly, USGS has application services (Option #1), but for some data sets it's also possible to generate direct download URLs (Option #2) to the public location of files.
Download Option #1: USGS Application Services
There's documentation here about the web services that are available:
If you're interested in ...
Three of the first sources that come to mind:
OSM hillshade basemap
USGS NED hillshade basemap
ESRI hillshade basemap (based on SRTM 30m)
Or you could always download the free SRTM 30m data and create the hillshade yourself.
Assuming you don't have a unique id field, you can use rule based symbols with the following filter
$id % 10 = 1
The % sign is equivalent to remainder, so any row that divides by 10 with a remainder, i.e, every 10th row will remain while the others will be filtered out of the result.
This question has been converted to Community Wiki and wiki locked
because it is an example of a question that seeks a list of answers
and appears to be popular enough to protect it from closure. It
should be treated as a special case and should not be viewed as the
type of question that is encouraged on this, or any Stack Exchange
site, but if ...
Since 2013 there is the EU-DEM 25 m: new Digital Surface Model (DSM), representing the first surface as illuminated by the sensors. You can download the GeoTIFF files here: http://www.eea.europa.eu/data-and-maps/data/eu-dem#tab-gis-data
In 2014/2015 there will be the release of the worldwide SRTM 30m data as announced here: https://www1.nga.mil/MediaRoom/...
As markusN says you have to use a “official” coordinate system. In Germany, these two systems are used frequently:
Gauss-Krueger (zone 2, 3, 4 or 5)
UTM (zone 32 or 33)
In some federal states of Germany Gaus-Krueger is replaced by UTM. In other federal states the replacement of Gauss-Krueger by UTM will still take some time. In the federal state of Bavaria ...
There are several open data initiatives on elevation (terrain) data.
A website with several alternatives (I have not checked them all) is available on this website:
For 90 meter accuracy dataset I would try the Shuttle Radar Topography mission (wikipedia article). I have used it on several occasions. An example of what ...
You can download a full set of US Congressional districts from the National Atlas, which includes a link to recent congressional districts. Once you've downloaded and extracted the data, you can use ogr2ogr to translate the data into another format if Shapefiles don't work for you. For example: