Questions tagged [species]
The species tag has no usage guidance.
1
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2answers
20 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
184 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
114 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 ...
0
votes
2answers
125 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
148 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
vote
1answer
351 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
435 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&...
1
vote
0answers
87 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
199 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, ...
