Unlike other supported formats, however, a "shapefile" refers to a collection of files, with ". In order to read shapefiles with NCL, you must have the ". It is developed and regulated by Esri as a mostly open specification for data interoperability among ESRI and other software products. The actual shapefile relates specifically to files with the ". Shapefiles describe a homogeneous set of geometrical features comprised of either points, polylines, or polygons.
These, for example, could represent water wells, rivers, and lakes, respectively. Each feature may also have non-spatial attributes that describe it, such as the name or temperature.
Sometimes there are more levels for example, France has 6 with even higher resolution. The global shapefiles are large, but it's possible to download individual countries separately. In order for your data to be masked correctly using this function, your longitude values must be in the same range as the longitude values on the shapefile.
NCL: Plotting and working with shapefiles
Most shapefile longitude values are in the range to For a sample of the first two routines, try this simple 4-line NCL script with your own shapefile data, or download sample shapefiles here. Several functions see above have been added to hide some of this detail. Within NCL, a shapefile appears as a collection of 4 or 5 specifically named variables that encode the geometry of the features, along with some number of non-spatial variables.
The number, names and types of the non-spatial variables depend upon the specific shapefile.
The geometry of a feature is composed of one or more segments. Segments in turn are composed of an ordered-list of X, Y and optionally Z tuples. Each entry in geometry has two values: geometry i, 0 specifies the index into variable segments of the 1st segment of the i-th feature, and geometry i, 1 denotes the number of segments that make up the feature. Similarly, each entry in segments has two values: segments j, 0 is the index of the 1st XY Z tuple of the j-th segment, and segments j, 1 is the number of tuples belonging to the segment.
With this encoding, any subsequent segments belonging to the i-th feature follow its first one in segmentsand all the XY Z tuples belonging to the j-th segment follow the first in the x,y, z variables. Non-spatial variables from the associated database i. To run this example, you must have the files "states.
These can be obtained from the National Map. In this case, the historical incidents of F5-class tornadoes in the USA are plotted. To run this example, you must have the "states" shapefiles from the previous example, along with "tornadx These can be obtained from the USGS's holdings on data.Skip to main content. You are here Home. Download data by country. The level of subdivision varies between countries GADMversion 1.
Global gridded population database Grid 30 seconds Climate Monthly climate data WorldClim Grid 30 seconds Gazetteer A gazetteer is a list of place names and their coordinates. The files you can download here are for use in DIVA for automatic georeferencing to assign coordinates to places. It can be imported to most other GIS programs. Shapefiles contain a single class of "vector" data such as points, lines, or polygons.
More info on format ; for developers. A gridfile with "country mask" indicates that the areas outside the selected country are masked out. For the other gridfiles, NODATA is only used for areas covered with water, except for the land cover grids, on which water is a separate class. A DBF dBase file is a dbase format database table.
Resolution The resolution is the size of each grid cell expressed as the length of one side of one square cell. The units are in arc degrees, minutes or seconds. When the cell size is small e. The size in square meters varies with latitude.
A cell with a 30 seconds resolution is about 0. High resolution files for large areas countries can be very large. This means that it may take a while to download these files, and that you will need a fast PC to work with them.
Country outlines and administrative subdivisions for all countries.Feature layers created from shapefiles do not possess any rendering information, and will be assigned with a default symbology. You can apply custom styling to ensure that the content is visible and usable in the context of a specific map.Code Sample: Map Suite Silverlight Edition Best Practices (Part 1 of 2)
For example, you could use this to visually differentiate between features originating from two different shapefiles, by applying a blue color to one, and a red color to the other. Pan and zoom around the map to view the symbology renderer set to the feature layer created from the shapefile.
While shapefiles contain no rendering information, other data sources such as Service Feature Tables or Geodatabase Feature Tables can contain such information.
As a result, the rendering properties of the other data sources can be pre-defined by the author. Skip to content. Branch: master. Create new file Find file History.
Latest commit. Complete an incomplete sentence, and make usage more explicit. Line of sight location usage reworded slightly. Make download instructions more explicit. Use getter and setter terminology in How it works, rather than classnames.
Other minor tweaks. Latest commit e Apr 1, Symbolize a shapefile Display a shapefile with custom symbology. Use case Feature layers created from shapefiles do not possess any rendering information, and will be assigned with a default symbology.
How to use the sample Pan and zoom around the map to view the symbology renderer set to the feature layer created from the shapefile. How it works Create a ShapefileFeatureTableproviding the path to a shapefile. Create a SimpleRenderer to override the default symbology.
The simple renderer takes a symbol and applies that to all features in a layer. Apply the renderer to the FeatureLayer by setting the renderer.
Download Free Shapefile Maps – Country Boundary Polygon, Rail-Road, Water polyline etc
Extract the contents of the downloaded zip file to disk. Open your command prompt and navigate to the folder where you extracted the contents of the data from step 1. Additional information While shapefiles contain no rendering information, other data sources such as Service Feature Tables or Geodatabase Feature Tables can contain such information. Tags package, shape file, shapefile, symbology, visualization. You signed in with another tab or window. Reload to refresh your session.
You signed out in another tab or window. Aurora Subdivisions Shapefile.You might be hunting to Download free shapefile for completing either your small industrial work for POC or for academic project use or for any NGO work. Here you will find the links of best resources to Download Shapefile for free, either its polygonpolyline and point feature shapefile, covering different subjects like Administrative Area Boundaries, Roads, Railways, population etc across the world.
Note: The Data Shapefile Downloaded from provided below link here, may or may not be authentic, accurate or incomplete. If you are looking for any shapefile of country which is not listed above please comment below so that we can search in our pitara of shapefile.
If we found we can upload it on the same. Diva GIS —. Website is developed by Robert Hijmans, which provides free Shapefile to download, covering around countries. You can directly select the country and category of shapefile and press on OK button to start download. GADM is a spatial database of Global Administrative Areas, which covers all countries data defining boundaries such as provinces, taluk, departments, counties, krong etc. Natural Earth Data :.
Natural Earth is maintained by Nathaneiel V. Geofabrik :. Geofabrik provides the current data from the Openstreetmap database, which is available either for free as well as premium shapefiles. Data can be downloaded as. Select the continent from the link provided for which you need to download the data. Open Street Map data :. This service is created by Jochen Topf and Christoph Hormann. Following data sets and its subcategories shapefiles can be downloaded from this website. Coastline Data processing: It covers land polygons of the world area i.
Generalized data sets: This section provides you to download Generalized coastline polygon shapefiles. Antarctic icesheet: Antarctic icesheet polygons and icesheet outlines can be obtained from here. Gis-Lab info :. World data shapefile can be downloaded from GIS lab. This global data are separated into 4 parts i. Select different zone to Download Free Shapefile Maps.The shapefile is a common standard for representing geospatial vector data.
There are several ways of working with Openstreetmap data and shapefiles. Developed and regulated by Esri as a mostly open specification, the shapefile format spatially describes geometries as either 'points', 'polylines', or 'polygons'. In OpenStreetMap terms these can be considered as ' nodes ', ' ways ' and ' closed ways ', respectively.
Each geometry has a set of associated attributes. Broadly speaking these are a bit like OSM's tags. The shapefile is in fact a grouping of several files formatted to represent different aspects of geodata:. There are also several optional files in the shapefile format. The most significant of these is the. Although not part of the Esri shapefile standard, the.
NOTE: Shapefiles have many limitations, like cutting attribute names. Whilst you may want to convert shapefiles into. From OpenStreetMap Wiki. Purge Help. Shapefiles - Other languages. Other languages Translate. Navigation menu Personal tools English Create account Log in.
It only takes a minute to sign up. How to export spatial datasets in R, such as tornados dataset in GISTools package, as a shapefile with the exact same spatial reference and the exact values? Note there is also a function in the maptools package to accomplish this, namely writeSpatialShape :.
You should look at the rgdal package, specifically the writeOGR function. I read them into R via:.
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At this point, the object states is a SpatialPolygonsDataFrame. Now I create a new directory " tempdir " and save the shapefiles there:. Sign up to join this community. The best answers are voted up and rise to the top.
Home Questions Tags Users Unanswered. Asked 4 years, 7 months ago. Active 6 months ago. Viewed 47k times. Mokhless Mokhless 1 1 gold badge 1 1 silver badge 7 7 bronze badges. What does Forced mean here? Active Oldest Votes. Wesley's answer is correct. Note there is also a function in the maptools package to accomplish this, namely writeSpatialShape : library maptools writeSpatialShape torn, "torn".
MichaelChirico MichaelChirico 1 1 gold badge 4 4 silver badges 15 15 bronze badges. This function does not retain the proj4string information. JeffreyEvans: so is there a way to pass that? MichaelChirico: thx but thats where I began and the issue is that it truncates to an Error There are posts about it. Now I create a new directory " tempdir " and save the shapefiles there: dir.
Wesley Wesley 2 2 bronze badges. Momchill Momchill 5 5 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Socializing with co-workers while Social distancing. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap.Email me and I'll find it for you.
Right to Know or Left to Wonder? Hazardscapes - Toxic and Nuclear Risks in your backyard. Free World Shapefiles by Country. State Shapefiles.
Global, coarse-resolution soil moisture data km are derived from backscatter measurements acquired with scatterometers onboard the satellites ERS-1 and ERS-2 to present and the three MetOp satellites The products produced are aerosol optical depths at 0. Includes shapefiles, kml and CSV files. Map hazardous waste facilities, polluters, toxic releases, superfund and more.
Free National Atlas of Transportation Shapefiles. Free Afghanistan Shapefiles. Includes facility name, address, amount released. Maps listed below and on following 4 pages are in alphabetical order.
The list is updated frequently. GIS enhancement allows planners and others to visualize large quantities of transportation data, often rendering it more meaningful. GIS helps highlight the transportation system's reach, coverage, modal relationships, key corridors, and relationship to our nation's economic activity and environment.
Digital Chart of the World Shapefiles. The is an upgrade and more current version of the original DCW below. Our mapping function will give you a preview of the data.
The DCW was created in the s.