Georeferencing specimen data in gis diva gis
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Georeferencing Specimen Data in GIS: DIVA-GIS PowerPoint PPT Presentation


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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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Georeferencing Specimen Data in GIS: DIVA-GIS

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Georeferencing specimen data in gis diva gis

Georeferencing Specimen Data in GIS: DIVA-GIS


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  • All files must be installed in the same folder and directory that they were originally made in, in order to open the project (*.div) on your computer (C:/DIVA-GIS/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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