Questions tagged [wildlife-ecology]

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Create ltraj in adehabitatLT Error

I'm trying to use adehabitatLT analyze animal movements. However, I'm having issues with creating a ltraj object in R. I have followed the as.ltraj() example in the documentation and I'm getting this ...
2
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1answer
47 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 ...
1
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0answers
34 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 ...
4
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0answers
48 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 ...
0
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1answer
27 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 ...
6
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2answers
190 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 ...
1
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2answers
30 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 ...
4
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1answer
105 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 ...
2
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0answers
299 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 ...
5
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2answers
1k 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 ...
1
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2answers
16k 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
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1answer
12k 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
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1answer
73 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
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0answers
60 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 ...
5
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1answer
125 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 ...
1
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0answers
110 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
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2answers
316 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
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0answers
362 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 ...
3
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3answers
554 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 ...
5
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1answer
271 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 ...