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Questions tagged [biology]

The science of life and of living organisms, including their structure, function, growth, origin, evolution, and distribution.

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38 views

Convex Hull not outputting expected number of features

I have a .csv file with observations of various species and I want a polygon to illustrate the area where those species occur. I ran the Convex Hull, grouped by the species' names field, which ...
2
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1answer
31 views

High-resolution, hyperspectral satellite imaging?

I am hoping to expand my (biology-focused) research to include satellite data. For this, I'd need satellite imaging that includes multiple values in the visible spectrum (specifically, above 490nm) ...
3
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1answer
160 views

Spatial Index on 100s of Millions of Records Taking Days in PostGIS? [closed]

I have a table with ~200million spatial records in it, and it is taking days to build a spatial index on the one geometry column: should this be taking so long? The geom column is of the type ...
4
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3answers
15k views

Measuring distance between points using QGIS?

I have a layer with about 500 single points. Now I want to measure the distance between each of these points and one specified observation point. I need the distance to show how far away from the ...
6
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2answers
3k views

Calculating Shannon's diversity using moving window in R

I have a raster where each pixel is a particular vegetation type. I'm interested in the diversity of vegetation types around each pixel. I'd like to assign a Shannon's diversity index value (see ...
1
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1answer
108 views

Getting species geodata (via Lifemapper)

In the search for species occurence data I stumbled on the Lifemapper project (http://lifemapper.org/). For creating biological models they posess a very comprehensive database. Unfortunately it does ...
7
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2answers
5k views

Maximizing Code Performance for Shapely

I've written this code in order to calculate the percent cover of grassland within a national park, within 20km^2 of points of recorded occurrences for a species. It is designed to only consider the ...
4
votes
1answer
483 views

Simple way to compare ranges and distributions of species, looking for correlation and differences between ranges

As a biology student just beginning with GIS, wondered if someone could give me an idea of what tools to go about using to compare the range of 3 species that have trophic effects on one another. I ...
1
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1answer
558 views

Designing ArcPad Quickforms to Collect Biological Data?

I am trying to design a Quickform in ArcPad 10.2 to enable efficient capture of biological survey information in the field on a Trimble Juno 3D. I am currently investigating using the Form Creation ...
3
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1answer
772 views

Counting animals using near infrared imagery from a drone

I am playing around with an idea of using a near infrared camera to fly transects to count animals on the ground. I have been involved in such work earlier, but on bigger mammals and observer based ...