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Questions tagged [file-formats]

A standard way that information is encoded for storage in a computer file

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97
votes
24answers
116k views

Converting between KML and shapefile (SHP) format?

My users are sending me point data that were digitized using Google Earth. How can I convert their KML to a shapefile?
35
votes
5answers
7k views

Advantages of using spatialite over shapefile? [closed]

I found spatialite more useful than shapefiles as it does not have the limitations of shapefile and it is also portable. Many people here use shapefiles to exchange data and even the experts do not ...
25
votes
7answers
5k views

Speed of various raster data formats

I'm having trouble locating any discussion or comparative benchmarking of different raster file formats (e.g., for use in data analysis in R). Does anybody have any insight into why particular formats ...
22
votes
3answers
5k views

How are GeoTIFF pyramids/overviews standardised?

While pyramids/overviews are not part of the GeoTIFF standard, many tools support creating them. For example vips/nip2, Orfeo Toolbox (otb) and ossim which all promise some support for creating those. ...
21
votes
3answers
10k views

How to access feature classes in file geodatabases with Python and GDAL?

I am trying to access a vector dataset in a ESRI File Geodatabase using Python + GDAL. I have successfully compiled GDAL with the file geodatabase API. The FileGDB driver is working correctly since ...
18
votes
3answers
2k views

What is the wire format for Google's new vector map tiles?

Google recently released new vector cartography for their mobile maps. I'm curious if anyone here has any insight into the wire format they use for transmission? I've experimented with a few formats ...
17
votes
2answers
12k views

Grid vs TIF vs IMG

Grid, TIF and IMG are three formats of raster files. In ArcGIS Desktop, apparently there's no difference between them. What is the difference between these three formats?
17
votes
1answer
1k views

The next big thing in standardized spatial data exchange format?

I remember reading something a few months back, in the latter half of 2012, about a coordinated group effort to design a new standard for sharing geographic / spatial data. It has or aims to have the ...
17
votes
2answers
35k views

Understanding Esri's .asc file?

Reading the ArcGIS help: Supported raster dataset file formats, I read that ASCII Grid file types are addressed with the singular file extension .asc for both 16 bit signed-integer (for discrete data) ...
16
votes
5answers
1k views

Most pervasive GIS formats?

Where can one find out what the most pervasive GIS formats are? For example, from the GIS file formats Wikipedia page, there 4 broad categories, each with many popular formats. Raster formats (13 ...
15
votes
4answers
4k views

Are ArcGIS *.lyr and *.mxd data format specs published?

Are the binary formats of *.lyr and *.mxd files published?
15
votes
5answers
2k views

Which data formats are best for Open Data distribution?

What are the pros and cons of different data formats (performance, file size, etc.) when considering open data distribution? Our organisation wants to publish data as open data. However, there is no ...
12
votes
3answers
4k views

Where can I find country borders data in plain text format? (XML, JSON, CSV, etc)

I'm trying to obtain some data representing the borders of all countries in the world. This data doesn't have to be very precise, it is to draw the countries on a computer screen. I did a bit of ...
11
votes
14answers
12k views

Which GIS support DXF and/or DWG?

Which GIS support DXF and/or DWG (preferably read&write)? Update: Are there any open source GIS supporting these or similar CAD files? Support of CAD files generally seems to be problematic. ...
11
votes
3answers
4k views

Advantage(s) of using underscores in ArcGIS file naming conventions?

In an introductory GIS course, it was insisted that all spaces within file and folder names be replaced with underscores. Why is this taught? Is there a clear benefit of doing so?
11
votes
4answers
14k views

How can I transform a georeferenced JPG to a georeferenced TIF?

I have an georeferenced JPG file and a JGW file containing the coordinates. How can I transform it to a georeferenced TIF file and a TFW file? I have tried to save the JPG file as an TIF file in ...
11
votes
1answer
952 views

What's the binary format of ENVI (Classic) ROIs?

I'm a Pythonist in an office full of ENVI/IDL users. I've created some tools to help bridge the gap, but one big stumbling block is ENVI Classic .roi files, which my colleagues use a lot. I can ...
11
votes
0answers
606 views

Parsing file format for attributes in Raster Product Format (RPF) maps and imagery?

I'm trying to implement an open-source NITF reader (using only java, no external libraries such as GDAL or NITRO), and its mostly going OK. However I'm having trouble understanding the RPF extensions, ...
10
votes
2answers
10k views

How to open the Electronic nautical chart S-57 data?

Anyone know how to open the Electronic nautical chart S-57 data by using GIS software e.g. Arcview, QGIS? and converted it to general GIS / CAD formats.
9
votes
3answers
5k views

Explaining difference between shx and shp files of shapefile?

I am searching for a more in depth explanation of the differences in shp and shx files to little avail. I mean beyond the 'shp contain geometry - shx contains an index of the geometry'. The reason I ...
9
votes
2answers
3k views

GDF — Can anyone suggest some good reading?

Can anyone give me a nutshell explanation of the Geographic Data Files format, or post a few URLs I might find enlightening? I get the sense (although I'm not sure) that GDF implies building ...
8
votes
2answers
167 views

File naming for Enterprise GIS database?

I'm designing the guidelines for an Enterprise GIS database. Part of this database will include customized geoprocessing tools using a variety of software. I'm interested in knowing whether anyone ...
7
votes
5answers
2k views

List of GDAL raster file extensions

I am trying to compile a list of file extensions that are accepted by GDAL, something like ['.tif', '.png', '.jpg', '.jpeg', ...] I found a list of GDAL Raster file formats, but the values in the "...
7
votes
3answers
2k views

Seeking software for opening .img files?

I have some cpc precipitation data stored in IMG format. Could anyone suggest a software beside ERDAS imagine or Arcgis which can be freely downloaded?
7
votes
1answer
5k views

Can QGIS projects be opened in ArcGIS for Desktop?

I am about to start a project with a number of people for a nonprofit organization. I am wanting to create the files in QGIS, but some of the people that I am working with are city officials and might ...
7
votes
3answers
319 views

Custom, low-level representation of streets and traffic rules

I'm new to GIS, and I'm still trying to gain an understanding of what can be represented in the various GIS files. Very generally I know(/think) that you can represent points, that lines, polylines, ...
7
votes
1answer
2k views

When saving a .qgs file in QGIS, another appears. Is this a backup?

When saving a project file (.qgs), which when executed is automatically loaded with qgis.bat, there's another .qgs file which appears in the same directory of the original project file, although this ...
6
votes
4answers
836 views

Is there a universal map/ layer format?

Just wondering if there is a universal map format that all GIS software can read. ie to quickly share layers with all our partner agencies which have different GIS Software, rather than have to ...
6
votes
3answers
6k views

Merging shapefiles with different geometries (point and polygon) to get single layer with multiple geometries?

I want to merge two shape files in which one is of point geometry type and other is polygon type in order to get a single layer containing both points and polygon in a single map.
6
votes
2answers
9k views

How to convert .geotiff --> .tiff?

How to convert .geotiff files to .tiff files (ordinary plain images)? Basically, I have cropped the image to a rectangle of interest and knowing its left-lower location and having chosen the pixel ...
6
votes
3answers
4k views

How to get WFS GetCapabilities information as JSON

I can get a WMS GetCapabilities response via AJAX call and I can convert response to JSON using ol.format.WMSCapabilities tool. But I need to make a WFS GetCapabilities query via a AJAX request and ...
6
votes
1answer
185 views

CRS information not recognized when geopackage is loaded

I am starting to transition from .shp to geopackage data format in QGIS. There are many benefits to the format that give it an advantage over shapefile for many of my projects. However, I am having a ...
5
votes
2answers
13k views

Exporting county level data in *.shp file to text (csv) file in ArcMap?

I have a shape file created as per the answer to my previous question, which includes county level means for each county in the US. How can I now export this data in a .csv file, e.g. with just the ...
5
votes
3answers
2k views

Is raster lossy and vector not lossy?

I am new to GIS, in school for it actually, but I come from a photography / graphic design background. So that said, I always thought that vector graphics were not lossy (scale up or down, doesn't ...
5
votes
3answers
3k views

What is a simple binary raster storage format which ArcGIS can read?

I have a C++ program that manipulates raster digital elevation models. I have been using ArcGrid ASCII format for results. It is simple to code and gets the job done, but it necessitates a decimal ...
5
votes
3answers
14k views

Write GeoJson into a .geojson file with Python

I want to write a geosjon object with the type <class 'geojson.feature.Feature'> into a .geosjon file. Therefore I tried to use with open(test.geosjon, 'w') as outfile: geojson.dump(...
5
votes
2answers
2k views

60GB .gdbtable file in my file geodatabase – what is it, and can I delete or make smaller?

The title says it all really – I have a single file named 'a0000000.gdbtable’ in my default file geodatabase that is 60 GB in size. I have a number of other files with .gdbtable extension that aren't ...
5
votes
2answers
932 views

What generation of the MrSID format is supported by ArcGIS 9.3?

This is probably old news to some, but I just learned that MrSID (.sid) files have different 'generations' of file formats - so there are MrSID Generation 2, Generation 3, and Generation 4 files. ...
5
votes
1answer
100 views

Loading DLG file into QGIS?

I downloaded hypsography (topo lines) in DLG (Digital Line Graph) format. The file came from OGRIP, although it originally came from USGS. According to Wikipedia, DLG files are topologically ...
5
votes
3answers
659 views

In what data format should I export a (lat,long,alt) or (x,y,z) grid to be compatible with the largest number of GIS software?

I am new to GIS and developing an application that generates a 3D grid with (latitude, longitude, elevation) or (x, y, z) metric triplets, and I would like to add an exporting feature that ensures ...
5
votes
1answer
828 views

QGIS processing default output vector layer extensions

You can set the default output-extension of a model in processing > options > general. The intermediate transactions in a model are processed in that default file format. After installing QGIS, the ...
5
votes
1answer
371 views

Location/format of inserted pictures used for marker symbols in ArcGIS Desktop?

I have an old mxd that uses several hundred custom made picture marker symbols. We don't know where the image files that were inserted as pictures marker symbols are, or what format they were in. We'...
5
votes
1answer
991 views

Can I use .crd and .dwg files as QGIS data sources?

I want to use my autocad files(.dwg) and my field files (.crd), and want to know if they are compatible with qgis.
4
votes
2answers
13k views

Converting TAB to MIF / MIF to TAB

How I can export (import) data from TAB format to MIF and vice versa?
4
votes
3answers
914 views

Which data formats can store Bézier curves?

I've heard that ESRI .gdb can. Are there other databases or file formats that can as well?
4
votes
2answers
563 views

Why did Esri create .zlas compressed LiDAR files instead of adopting .laz?

I am talking about the Esri Optimized LAS file format for compressed LiDAR files (.zlas). While the uncompressed format (.las) from ASPRS was adopted by practically the entire Remote Sensing and GIS ...
4
votes
1answer
690 views

smallest, lossless, GDAL ready image format

I would like to know what the smallest file format is I can use with GDAL that fulfills the following criteria: lossless compression (relatively) easy to read/write with GDAL Python bindings least ...
4
votes
2answers
894 views

What format is this data in?

I ran into a file today that is in a format I'm unfamiliar with, and I'm hoping that someone can identify it. The file extension is CTZ, but the only file type I found on Google with that extension ...
4
votes
2answers
98 views

How to store and edit data with a defined topology using open software and formats?

I'm looking for a way to store and edit spatial data that preserves topological information. In my concrete application, I need to represent triangular meshes, which consist of unique nodes and ...
4
votes
2answers
3k views

IDRISI .vec file translator to ESRI shapefile format?

I've recently got hold of almost 20 years old IDRISI .vec files which I'd like to convert to ESRI shapefile. I've been struggling to find any translator for this file format so far. Does anybody know ...