Questions tagged [species]
The species tag has no usage guidance.
14
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20 views
How can I remove small polygons left of a layer after using Erase tool in ArcGIS Pro?
I am new to more advanced use of ArcGIS Pro. My case involved cutting unnecessary parts of an IUCN range map of amphibians (I need only parts of ranges in Europe excluding Turkey and Eastern Russia). ...
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0answers
21 views
Average area calculation differences between raster stack and single Maxent models
I ran 100 bootstrap replicated models, for which I want to calculate the area of suitable habitat based on three different threshold rules (MTP, ESS and MaXSS).
The issue I'm having is that for the ...
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0answers
225 views
Trying to make a fish diversity map using ArcGIS 10.7.1
I'm relatively new using ArcGIS. I want to make a fish species richness map (or fish diversity map; essentially tells you how many fish species are in each grid cell). Things I did so far:
Obtained ...
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1answer
53 views
Color grid if values in grid exceed threshold - species distribution in QGIS
I have distribution data of a set of species (plants, mosses and lichens: 13 species total) in the Netherlands.
I made a grid that divides the Netherlands into 1x1 km squares. I am not interested in ...
1
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1answer
241 views
Counting unique species in polygon layer and buffer
Within QGIS I'm working on a data set that contains species at 100m resolution (eg OSGB 6 fig) and 10m or finer resolution (eg OSGB 8 or 10fig). The objective is to count the number of unique species ...
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2answers
47 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 ...
3
votes
1answer
263 views
From areas of several species ranges (polygons) to a map (raster) expressing the count of overlapping polygons
I am not able to resolve the problem that follows. I have some separate shapefiles files, each one representing a given species range. Some layers have multiple polygons.
I would prefer to solve this ...
1
vote
1answer
171 views
Extracting raster values from polygon perimeters using ArcGIS Spatial Analyst?
I am currently working on a project to identify local ponds or water bodies that have high probability of species occurrence. I'm using BioClim climate data, SSURGO soil data, and a DEM layer for a ...
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2answers
183 views
Species ranges into fishnet grids
I need to create a fishnet grid (presence and absences) form species distribution areas (polygon shapes). But I need to define that presence (value 1) is correct when more than 30% of the grid is ...
1
vote
1answer
209 views
Kriging predictions for presence only data with Maxent
I was doing some geostatistical analysis (variogram+kriging) for a "presence only" type data in a species distribution modeling context. Since, we know that when estimating the (empirical) variogram, ...
1
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1answer
669 views
Designing interactive map of botanical garden in QGIS?
Using QGIS is absolutely new to me but I hope, we can make it as short and easy as possible to put my idea into practice. I hope that QGIS is the appropriate program for this purpose.
I have COREL-...
2
votes
1answer
677 views
Is there a way to create a presence/absence matrix of polygons per cell in a grid using qGIS?
I'm working in QGIS with species distribution polygons and I want to know how many cells in a grid does the polygon overlap. I've tried creating random points within the polygon and then used vector&...
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0answers
115 views
Maxent Probabilities Values
I am working on my first experiment with Maxent.
I am using two different species.
When I receive the output map and look at it in QGIS the values for suitable habitat probability do not sum to 1. ...
2
votes
0answers
235 views
Risk and vulnerability analysis for the spread of alien species [closed]
Based on knowledge about the potential for proliferation of alien forests species we are looking at possibilities for modelling the process.
Inputs should be area for initial plants, wind, elevation, ...
