Questions tagged [wildlife-ecology]

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8
votes
4answers
757 views

Extract date, time and GPS position linked to road crossing

I am using QGIS. I have a large dataset of approx a hundred animals and I want to determine the number of successful road crossings and extract the date, the time and the two GPS coordinates before ...
6
votes
2answers
243 views

Calculating daily travel distance from large dataset using QGIS?

My dataset is around 200 days worth of data on the daily distance travelled by a troop of monkeys. I've never properly used QGIS on my own so don't really know where to start. All of the days are ...
5
votes
2answers
2k views

Adding attribute features from the intersection of a grid with a point shapefile?

I want to calculate the frequency of observation of an animal in a forest habitat within the different zones of my study area. To do this I will use the simple equation (number of individuals)/(survey ...
5
votes
1answer
273 views

Anyone have recommendations on data collection system for bird point counts?

We will be conducting point counts this spring and summer, and would like to move away from paper data entry forms (yeah, I know). I have spent a little time exploring ArcPad (10), there are ...
5
votes
1answer
128 views

Relative position of nodes

I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement ...
4
votes
1answer
114 views

Automatic polygon placement from trail

I have a shapefile with >300 points that correspond to the points where vegetation survey plots were carried out 10m from the road on both sides. Plots have the dimensions 20mx50m. The attributes ...
4
votes
0answers
55 views

Quantifying similarity between two independent areas?

I'm assessing areas for suitability for species relocations, so essentially I'm looking to quantify how similar a possible relocation site is to a source site in several metrics. The species may ...
3
votes
3answers
625 views

Saving separate output files when iterating ArcGIS model?

I need to run a model in ModelBuilder 1000 times in order to obtain the average distance of random points in a wildlife species' home range to anthropogenic features. I need to find the average of the ...
2
votes
2answers
25k views

Error in (function (classes, fdef, mtable) : unable to find an inherited method for function ‘shapefile’ for signature ‘“NULL”’

I've used the following code to generate home range isopleths using r: library(rhr) library(rgeos) #list all *.txt files. fls <- list.files(path = "C:/Users/evan/Desktop/mydir", pattern = "*.txt",...
2
votes
1answer
77 views

Network service area mapping over open ground

Given a timestamped start location, a timestamped end location and a known average speed is there any way I can map everywhere someone (or something) could have possibly been between the two ...
2
votes
1answer
18k views

Error: undefined columns selected

My question is simple and hopefully can be answered quickly. I have a code in R that is for calculating home ranges. Everything works except one line of the code, which I've included here: locoh <-...
2
votes
1answer
77 views

Method for Spatial Analysis of Raptor Predation

I currently have presence data on two birds, a falcon species and the grouse that it prefers to hunt. These data are in two point shapefiles, one for each species. The grouse shapefile represents all ...
2
votes
0answers
379 views

Choosing bandwidth and scaling factor for Kernel Density Estimate in ArcGIS Desktop?

I have some points that represent animal locations over the course of a few months at the scale of ~20 sqkm. I am emulating the work of previous researchers in this field, but I'm having trouble ...
2
votes
0answers
62 views

How to create a surface area that interpolates and visualizes trends in physical activity in ArcGIS?

I have a dataset that contains several hundred telemetry points for my focal species around twilight hours. Attached to these points are mean values that represent how active the animal was 10 ...
1
vote
2answers
373 views

How to make input data in MaxEnt with several occurences at the same coordinates?

I have insect traps data with several hundreds insects caught every day. In this paper, authors say "Running the model using the number of mosquitoes per trap-night resulted in clustering of high ...
1
vote
2answers
37 views

SDM: Dealing with coarse environmental data

I wish to determine the most important environmental covariates controlling a species distribution. I have a large collection of species presence data for a small survey area (e.g., 600 presence ...
1
vote
0answers
42 views

Calculate % agriculture and % forestry cover across each 10km square of the UK

I am working on investigating the relationship between agricultural intensity and the diversity of birds. I have a shapefile of a map that splits the UK into 10km squares and for each square I need to ...
1
vote
0answers
139 views

How Can I extract region-specific Information from ascii grid file in and run spatial GLM's in R?

I have data on various climate variables in acsii grid format. I have imported data into R using Rainfall<-read.asciigrid("E:/R Learning Project/Rainfall.txt") and then used plot(Rainfall) to ...
1
vote
0answers
389 views

Generating a predictive map with standardized variables

I have a model from which I am attempting to create a predictive map (in GIS, but I'm aware of some options in R). The response values are constrained to [0,1] using an offset term in the model (see ...
0
votes
1answer
55 views

Why do moving window neighborhood analysis when building habitat model using ArcGIS Desktop?

I am currently developing a habitat model within ArcGIS Desktop for coyotes as a final project. One of the papers I read for my research did something similar, but they used a moving neighborhood ...
0
votes
0answers
20 views

Collecting public comment (Points / Lines / Polygons) in online mapping application

Use Case: Author/deploy public facing web map displaying wildlife locations. Allow public stakeholders to easily draw and attribute points, lines, and polygons denoting important wildlife and ...