Questions tagged [species]

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3 votes
2 answers
174 views

How to identify all species observed in each cell of a research grid

I have created a grid map as a shapefile. I have added a point layer that includes “species name”, coordinates and etc. I put a part of it below. Now, My problem is, when I use “count points in ...
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1 vote
2 answers
150 views

Creating survey form for Qfield for inputting flora species (and quantity) and in zones

I have been using QGIS off and on for a few years but only for basic stuff. I need to design an easy to use form within Qfield for the botanists to use. We need to survey flora species (>300) of ...
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0 votes
0 answers
70 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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0 votes
0 answers
256 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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  • 11
0 votes
1 answer
90 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 ...
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1 vote
1 answer
383 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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  • 304
1 vote
2 answers
61 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 ...
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3 votes
1 answer
339 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 ...
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  • 325
1 vote
1 answer
203 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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0 votes
2 answers
215 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 ...
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1 vote
1 answer
263 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, ...
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  • 141
1 vote
1 answer
794 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-...
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2 votes
1 answer
781 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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  • 21
1 vote
0 answers
125 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. ...
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  • 11
2 votes
0 answers
247 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, ...
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