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

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55
votes
19answers
41k views

How to convert between KML and Esri's shapefile (SHP) format?

My users are sending me point data that were digitized using GoogleEarth. How can I convert their KML to a shapefile?
19
votes
5answers
783 views

What are advantages of using spatialite over shapefile?

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 ...
15
votes
5answers
847 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 ...
14
votes
4answers
550 views

Most pervasive GIS formats?

Where can one found 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 ...
14
votes
3answers
1k 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 ...
13
votes
4answers
1k views

Are the ESRI .lyr and .mxd data format specs published?

Are the binary formats of .lyr and .mxd files published?
11
votes
3answers
2k views

Where can I find country borders data in human-readable format?

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
1answer
337 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 ...
11
votes
2answers
1k views

Understanding the .asc file

Reading the ESRI 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) ...
10
votes
14answers
5k 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. ...
10
votes
1answer
1k 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 ...
9
votes
2answers
1k views

Grid vs TIF vs IMG

As the title suggests both of the above three formats are raster files. In ArcGIS, apparently there's no difference between them. So what's the difference between these three formats?
9
votes
2answers
2k 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 ...
8
votes
2answers
149 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
3answers
1k views

ArcGIS file naming conventions: is there an advantage to using underscores?

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?
7
votes
3answers
243 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
265 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
2answers
966 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 ...
5
votes
3answers
5k views

Can I convert a kmz file to kml?

I have a kmz file. Is there an easy way to convert it to KML? Can I just "unzip"?
5
votes
2answers
212 views

Can we merge shapefiles with different geometries (point and polygon) to get a single layer which shows both 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.
5
votes
3answers
541 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
2answers
812 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
3answers
338 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 ...
4
votes
2answers
389 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. ...
4
votes
2answers
163 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
1k views

How to read this GRIB data

on this open FTP server (ftp://ftpdatos.aemet.es/modelos_numericos/hirlam005_peninsula/) you can find HIRLAM models from the Spanish meteorological service. The documentation in the LEEME files (in ...
3
votes
3answers
132 views

E00 file structure?

I am trying to write a java application that reads and visualizes data from E00 file. I cannot find any sources describing what is the structure of an E00 file and also what information does it ...
3
votes
2answers
705 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 ...
3
votes
1answer
119 views

rgb2pct.py increases size of file 20 fold!

I wanted to reduce the number of bands of a tif file from 3 to 1... I used this command rgb2pct.py -n 256 fnp_braunschweig.tif fnp_bs.tif and it increased the size from 31mb to 778mb I actually ...
3
votes
3answers
818 views

Convert .dwg file into .dwf file using Teigha tool

I am using teigha tool to convert my dwg file into dwf file. Can anybody help to explain the procudure for the same. Your prompt reply will be greatly appreciated!
3
votes
2answers
78 views

What is the best plain text format for georeferenced raster data?

I have to translate satellite images in a file in .txt format or another, such as Excel or .csv, in which there are pixel values corresponding to (longitude,latitude) couples. What is the best file ...
3
votes
2answers
234 views

ArcGIS Desktop - Web Services Definitions

Aside from .LYR files, is there a file format (preferably open) for defining web service endpoints for Arc products? For example, if I publish a WMS feed, can I provide a downloadable resource for ...
3
votes
2answers
65 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 ...
3
votes
2answers
859 views

Change output file type in QGIS georeferencer?

I have successfully georeferenced a raster file via the Georeferencer plugin (Georeferencer GDAL Version 3.1.9) in QGIS 1.7.0. However, I noticed that the output georeferenced raster file is in TIFF ...
3
votes
2answers
241 views

ENVI BIL file algorithm logic

I have a 6 band Landsat image, RGB and 3 NIF bands. As far as the Band Interleaved by Line (BIL) method goes, the resulting image should have, and I quote ENVI manual: the first line of the first ...
3
votes
0answers
30 views

Library for parsing scientific PDS files?

Does a library exist for parsing the PDS files that scientific planetary data gets shipped as? For example, here's a link to to the lunar topographic data from the Lunar Reconnaisance spacecraft ...
3
votes
0answers
106 views

How to view Esri GRID format file in wxpython file browse window? [closed]

I'm trying to browse for all kinds of vector and raster data using a filebrowsebutton. The problem is I don't know how to let the browse window see the Esri GRID files (which contains a folder and a ...
3
votes
0answers
218 views

GFS SIG/SFC file format of siganl.gdas/sfcanl.gdas analyzing/decoding problem

I am creating a database from datafiles. I encountered many fails and errors, which I have already fixed (also with the help of this Q&A web). Now I am stucked a bit in decoding of 6 files because ...
2
votes
2answers
4k views

How can I export county level data in a .shp file to a 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 ...
2
votes
2answers
1k 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 ...
2
votes
2answers
75 views

Raster format to read with python

I currently have a DEM raster stored in an ESRI geodatabase. I've been asked to create a purely python (e.g., no arcpy functions) program that works with the values. Therefore, I need to convert the ...
2
votes
1answer
333 views

Can you explain this WKT multipolygon format?

I am confused by the output I'm getting from ogr2ogr when converting a shapefile to WKT. What I'm expecting to see is something in the form below (from Wikipedia): MULTIPOLYGON (((40 40, 20 45, 45 ...
2
votes
1answer
102 views

Map formats supported by QGIS

May i know whether QGIS supports the following map formats? (1) S-57 Electronic Navigation Charts (Naval Maps) (2) Army/IAF Maps in DGN (3) DTEDO0, DTEDO1 and DTEDO2 (4) GeoTIFF (5) DTED
2
votes
2answers
626 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. Thanks.
2
votes
1answer
103 views

Error while trying to upload a .bsq file to the geoserver

I am trying to upload a .bsq file (ENVIHdr Coverage Format) to the geoserver. While doing this I got an error message. I am using the "GDAL" Extension for the geoserver. The error message is: "Could ...
2
votes
1answer
1k views

How to open or import .sdc files in QGIS?

I have some .SDC files i want to look at but i dont have arcview installed. is it possible? i couldnt even find a software that does sdc to shp conversion. any idea? i am using qgis 1.7.4 on both ...
2
votes
0answers
68 views

What is a good way to retrieve geographic data along with imgs and mp3 files?

I'm working in the Django backend of an audio guide for tourism with mobile devices. Basically, the client (Phonegap app for Android and iOS) can follow a route over a map (Leaflet client) and see ...
1
vote
2answers
3k views

Converting TAB to MIF / MIF to TAB

How I can export (import) data from TAB format to MIF and vice versa?
1
vote
1answer
62 views

Is it possible to insert note to remember the info of a project?

Sometimes I need to open an old project, and mostly I remember how it works (i.e. the structure, the formatting and so on) but sometimes not. At other times I open a project composed by a colleague ...
1
vote
1answer
56 views

How to extract data from Geodatabase?

We have been happily using the 2010 Census Demographic Profile data in Shapefile format for some time. We now want to start using the ACS 5-year Estimates Data Profiles which, sadly, are only ...