This page contains the latest information about Distance, including news, known problems, and material for download (replacement sample projects, Distance add-ons, etc).
If you are having problems with Distance, please check the problems page.
Unless indicated otherwise, all of the downloads below are packaged as self-extracting archive files. To download an archive file, click on its link. Once it has downloaded, execute the file to unpack it, and then see the readme file for futher instructions.
- MapObjects runtime library
- Library needed for the Design Engine; this is part of the Distance software installation. However, re-installing MapObjects may alleviate some difficulties experienced by users of the Design Engine. However, do not install unless advised to by one of the Distance support team. A documentation file is also available.
- DAO database engine
- This archive contains the DAO 3.51 installation package, from Microsoft (about 3MB in size). Re-installing DAO has been found to solve a “Run time error 91” problem that can occur in Distance on some computer configurations. See the known problems list for details. Warning: do not install unless advised to by one of the Distance support team.
- RunAnalysisEngine - Visual Basic code for running the D4 analysis engine
- Contributed by Len Thomas.
- This short Visual Basic 6 project shows how to run the D4.exe analysis engine (or older versions) from within that environment. It works by calling a whole bunch of Windows API functions. The code is in RunDistance.frm, which is just a text file so even if you use some other environment (such as Visual C or Delphi) it will hopefully still be of use. Comments welcome.
- The format of the output files is documented in the Distance manual (see Saving results to file) – I recommend you read results from the stats file as it has a nice compact format that is easily machine readable.
- [Note - the code could easily be updated to run the D5 analysis engine,
- GxHisto - A macro for reproducing the detection function histograms in MS Excel 97
- Contributed by Dr. Tim Gerrodette, Southwest Fisheries Science Center, NMFS.
- This macro allows you to reproduce the high-resolution detection function histograms produced by Distance 3.5 and later within Microsoft Excel as MS Charts. You do this by copying the graph data from Distance (by clicking the copy button), pasting it into Excel, and running the macro. Distance already provides the facility to copy the plots as pictures, but these pictures can not then be edited. Using this macro, you are free to change the plot format (colors, axes, etc) as you wish.
- Note: this macro only works in Excel 97 or later - if you have an earlier version of Excel please contact Dr. Gerrodette (address is in the download’s readme).
- Excel geometry functions
- Developed by Dr. Jeff Laake, National Marine Mammal Laboratory, US NMFS
- This package is an add-in for Microsoft Excel that performs various trigonometric calculations for plane and spherical geometry, plus a number of other related calculations. It was developed by Dr. Laake in response to his own needs for the analysis of marine mammal surveys and other types of data. The above link takes you to a web page that describes the functions in more detail and allows you to download the add-in.
- Information and Excel macro for converting data stored as frequency of counts in different distance intervals into format required by Distance
- Contributed by Matt Schlesinger, Aaron Ellingson , Jeremy Lindsell and others.
- This zip file contains replies to the following email which Matt posted to the distance-sampling list in December 2004. It also contains an Excel file with a macro for doing the job (by Aaron) and a Word document describing how to do it manually (for another similar data set, by Jeremy)
- “[…] I’m converting my bird point transect data to Distance format. We recorded birds in 25-m distance categories. The data were entered into MS Access in the following format, to match the data sheet for easy entry (each of these fields separated by commas are columns in the data table):
Site, station, visit, species, 0-25, 25-50, 50-75, 75-100, >100
- Each row is a combination of site, station, visit, and species, with the total number of detections within each distance category noted in the appropriate column. […] Distance requires that each detection be its own row. […] Does anyone know of a way to convert a format like mine to Distance format easily?”
- Any other ideas?…
- If you have written a utility program that you think others would find useful in their dealings with Distance we would be happy to publish it here. Please contact us.
Running Distance on other operating systems.
Although we don’t have any direct experience, Distance should run without problems within the emulation software VMWare, win4lin, Parallels, VirtualBox, etc. For VMWare, note that there is a free version called VMWare player, and if you search the web under something like “Free VMWare” you will find instructions about how to set up operating system images using free software (one site is http://johnbokma.com/vmware-player/). VirtualBox is opensource and supported by Oracle. Other possibilities are to use the free emulators Bochs (pronounced “box” - slow, apparently) or QEMU (with the accelerator module). For up to date information, try searching the web for “PC Emulators” or “PC Virtualizers”. If you try any of these solutions, please let us know how you get on! We have one report of VirtualBox running Distance 6.0 under Ubuntu platform without trouble.
For OS X, many emulators are available - see http://www.macwindows.com/emulator.html for a list and latest news (examples include Parallels and the opensource VirtualBox). If you try any of these, then let us know how they work. Parallels (v11) worked fine on OSX releases “Leopard”, “Snow Leopard”, “Lion”, “Mountain Lion”, “Mavericks” and “El Capitan” on both PowerPC and Intel Macs (thanks to Jack Lawson for providing this information). Another option, if you have an Intel-based Mac, is to use Apple’s Boot Camp software to boot into Windows.
Cross-platform text issues
One caveat (true of all cross-platform transfers) is that users should be careful when creating ASCII text files on other operating systems for use in Distance. They need to have the Windows carriage-return and line-feed characters at the end of each line. There are many ways to ensure this happens, and users who work under multiple operating systems will be well aware of the issue already.
Shapefiles, projections and other GIS matters
- ESRI Shapefile Technical Description (PDF). This is an white paper produced by ESRI describing the internal format of a shapefile. It also contains some very useful information about how you should order the vertices of a polygon, for example, to create a “clean” shapefile.
- Geographic Coordinate Systems and Map Projections (PDF). This is an appendix from Samantha Strindberg’s PhD thesis (Strindberg 2001). Sam was a PhD student here at the University of St Andrews and developed the methods used in the survey design part of Distance. This appendix gives some background information about geographic coordinate systems and projections: what are they, which should you choose, etc. Hopefully it will be useful for those not familiar with this aspect of GISs.
- Spatial data handling in R cheatsheet Martin Wegmann maintains a “cheatsheet” for dealing with spatial data in R.