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Georeferencing Specimen Data in GIS: DIVA-GIS

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Georeferencing Specimen Data in GIS: DIVA-GIS. Vector. Raster. Spatial Data Models. Points, Lines & Polygons. Grid-based, including Photos. DIVA-GIS Introduction. Free program for biologists, specifically designed for biodiversity research, niche modeling

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spatial data models
Vector

Raster

Spatial Data Models

Points, Lines & Polygons

Grid-based, including Photos

diva gis introduction
DIVA-GIS Introduction
  • Free program for biologists, specifically designed for biodiversity research, niche modeling
  • Niche modeling is constructing empirical models of spatial distribution of a species based on the environmental conditions where the species is known to be present (use BIOCLIM, DOMAIN in DIVA).
  • DIVA is similar to ESRI products, but easier to use for simple functions
  • All files must be installed in the same folder and directory that they were originally made in, in order to open the project (*.div) on your computer (C:/DIVA-GIS/
  • You can export DIVA as .dvx files to open on another computer
  • In general, when you start a GIS project, keep your files in one folder
add a new shapefile
Add A New Shapefile
  • The layers on the left are called features, many of them are “shapefiles” with the extension .shp
  • To add a new shapefile, Click the “+” on top menu
  • Find shapefile of interest (e.g. worldlakes.shp in Kenya-DIVA folder)
  • Add it to layers on left
  • Adjust position in layers, change display values
  • Hit magnifying glass with box in it to “Zoom to Selection”
editing diva features
Editing DIVA Features:
  • To do anything with a feature (changes colors, symbols, get information, etc) first select it.
  • Right click, a properties menu will appear
  • Then change the color, symbols, etc. by double clicking on the box
editing features
Editing Features
  • To change a single class to multiple unique values with different colors, first set the style of the single value to solid fill
  • Choose “Unique Values”, and hit reset legend.
  • Right click directly on the feature in the left menu to change the order of the layers, etc.
to display coordinates from a text database file
To Display Coordinates FromA Text/Database File
  • Click “Data” on top menu
  • Select “Import points to shapefile”, choose “From .TXT”, pick file
  • Check the lat/long fields (must be in decimal degrees)
  • Change Field names if necessary
  • Click Apply
  • New shapefile will appear on layers on the left
to make a selection select by values
To Make A Selection (Select by Values)
  • Choose the “Kenya” data on the left (these are NIMA features data)
  • Select the “Query” tool (hammer)
  • Click “Select by Values” tab, choose Adm1
  • Leave checkmarks on 7 and 9 (Western and Nyanza Province), click apply
  • The selected points will appear in yellow
  • See statoids.com website for NIMA adm designations
make selection into a shapefile
Make selection into a shapefile
  • Hit “Convert to Shapefile” button (s with arrow)
  • These selected points will appear as new shapefile on the left
querying for features select by query
Querying for features (Select by Query)
  • Select on the feature on the left
  • Click the “query” (hammer) button, use “Select by Query” tab
  • Field is “Fullname”
  • Criteria is “=“
  • Choose a name in value and hit “Add”
  • Click Apply
  • Zoom to selected feature by hitting button with yellow box in magnifying glass
measuring on diva
Measuring on DIVA
  • Select the arrow tool
  • Click on the starting point
  • Click on the end point
  • The distance appears on the bottom middle (m, km)
  • Double click to end the line
  • Remember that NIMA data are only accurate to nearest minute (why the points appear in a grid)
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