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Questions tagged [maxent]

Software and algorithm for ecological niche modeling.

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Correlation analysis between large number of environmental rasters

I am trying to run a correlation test in R for 761 environmental rasters, but that seems to be too many to run at one time. For context, I have average monthly SST and CHL rasters over roughly 50 ...
Caroline Golightly's user avatar
1 vote
0 answers
47 views

How to properly use BlockCV method of cross validation in dismo MaxEnt model in R?

This is what I have right now, but the model looks exactly the same as it does without the cross validation. The .html it spits out has no "training" data in the ROC curve or sensitivity ...
Emily Schroder's user avatar
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40 views

How to run sensitivity analysis of maxent SDM in R?

I have been told that I have to run sensitivity analysis on a species distribution model. I cannot find much on this, but I suspect that it means that I would have to re-run the model 999 times, each ...
Birdman's user avatar
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Convert Raster to ASCII fundamentally changes my raster layer

I'm a grad student with experience in GIS but not advanced by any means. Using ArcMap 10.2.2 on our lab's computers. I'm trying to prep environmental variable layers as ASCII layers to analyze using ...
Brian Kron's user avatar
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82 views

Fill hole in a raster

I'm currently using ArcGIS Pro to process my Maxent output (habitat suitability). There's a hole in it and I'm planning to fill it with the nearest data. I've tried using the "Fill" tool but ...
MapperIndo's user avatar
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72 views

NAN String on Maxent

I'm using NDVI for one of my environmental layers, i got it from google earth engine and process the data using ArcGis Desktop. I already convert it to ascii and check there's some NAN in my data. ...
MapperIndo's user avatar
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94 views

Error in maxent log "occurrence point missing some environmental data...skipping sample"

I am very new to Maxent. I did a test run for a species distribution model in the program and I received many errors of the same issue that are recorded in the .log file for the run. Here is an ...
Melissa Duda's user avatar
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57 views

Error in ENMeval when running MaxEnt

I have an error in {ENMeval} when running Maxent using R: "error is Error in data.frame(..., check.names = FALSE) : arguments imply differing number of rows: 12659, 0" I looked it up and ...
하의린's user avatar
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15 views

losing classified values when converting from .tif to .asc (for Maxent)

I have 10 aspect values in a .tif generated by ArcGIS from a DEM file. When I convert to .asc (necessary for Maxent) it becomes a single value arc from -1 to 360(m). I need to use this as a ...
Tal_1's user avatar
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Converting polygon vectors into raster which is percent of pixel which is covered by polygon using QGIS

I’ve got maps of fish farms which I think might be relevant for my species distribution mode. However these maps are essentially just polygons drawn over individual fish cages. I’ve also got data on ...
PowellHall's user avatar
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107 views

Error 110434 using the MaxEnt tool in ArcGIS Pro

First time using the Presence-only prediction tool (MaxEnt) and I've been running scenarios with it and testing how different parameters look as outputs. When I try to run the tool using the NLCD land ...
H_0814's user avatar
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1 vote
1 answer
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Area calculation of classified raster layer

I am working with QGIS 3.22.4 and want to analyse the output of MaxEnt. Therefore, I have a raster layer showing the habitat suitability for my species in the whole oceans as .asc-data type. I have ...
Ben's user avatar
  • 13
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52 views

MaxEnt error java.util.NoSuchElementException

I am new to using MaxEnt (and Java) and after selecting my presence-only data in .csv and my environmental variables in .asc, when I try to run the analysis, I get this error message: Error reading ...
smartinm's user avatar
1 vote
2 answers
167 views

Random forest/Maxent environmental predictor layers using vector data, in GEE

I am attempting to use a vector layer as a predictor environmental layer for use in classification/predictor models (eg Random Forest/Maxent). I have attempted to include a bathymetric substrate layer,...
Jcd's user avatar
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859 views

Maxent error : java.lang.NumberFormatException : For input string « nan »

I'm doing predictive distributions for some species using Maxent and QGIS. I downloaded my environemental data from : https://worldclim.org/data/cmip6/cmip6_clim30s.html They are multibands data so I ...
Lddc's user avatar
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1 vote
1 answer
125 views

Connecting presence point to nearest raster (brick)

I am currently trying to run the maxent modelling in R on a dataset of moon jellyfish in the north east Atlantic waters. I have environmental variables datasets from Copernicus ocean monitoring ...
Lin Forrest's user avatar
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324 views

Calculating area of habitat suitability map obtained from Maxent using ArcMap

I am doing a species distribution modelling using Maxent. I got the species distribution maps from maxent and I reclassified the map into four group as high, moderate, low and unsuitable areas in ...
Bandana Adhikari's user avatar
3 votes
1 answer
178 views

Creating Raster Map including if condition in QGIS

I have two habitat suitability maps for one species. One current map and one map for 2050 under climate change. Based on these two maps I created a change in habitat suitability map (by subtracting ...
FreddySorbe's user avatar
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0 answers
229 views

Fatal MaxEnt Error: java.lang.NumberFormatException: For input string: "-∞"

I'm trying to use MaxEnt to project species distribution. It worked to project probability the first time, but when I've put in the projection layers directory it comes up with this error and then ...
Issy Urquhart's user avatar
0 votes
1 answer
321 views

Error saving .asc bias file in R

I used the following code to create a bias file in R for MaxEnt. I am able to create the bias file, but I am not able to save it as ascii (see error message). My lat/lon csv file contains only points ...
Mary's user avatar
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196 views

Maxent SDM projections coming up almost entirely blue

I have been generating SDM models and projections in Maxent. I have had some success with one set of variables (some Hydroshed variables mixed with World CLIM variables); however, I am having a bit of ...
GoingForGasps's user avatar
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1 answer
576 views

Maxent can't get past "javalang.ClassCastExeption: [D cannot be cast to [F" error message

I have turned all stones I can think of how to solve this, and it feels like it should be something simple I am missing, but I just can't get Maxent to work. When Maxent (v.3.4.3) reaches the step &...
Pancholp's user avatar
  • 103
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117 views

Bootstrapping Reclassified Layers of Two Species in QGIS for Suitable Area Overlap

I have a very surface-level knowledge and familiarity with QGIS. I currently have 30 reclassified QGIS layers of suitable area based off of 30 MaxEnt individual runs for 2 different species. All ...
qgis_newbie's user avatar
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172 views

Calculating AICc value from Maxent output

I want to calculate the AICc value for my Maxent models. On a little search, I have found that calc.aicc function if implemented in R, can help in finding out the AICc value. But, I am not sure, what ...
coder_001's user avatar
3 votes
1 answer
231 views

Error when executing maxent algorithm with categorical variable

I tried to use maxent algorithm where I have categorical variable as follow : mod <- dismo::maxent(x=env, ## env conditions ( rasterstack) p=Pre_final, ##(...
user1988's user avatar
-1 votes
1 answer
170 views

How maxent's algorithm uses data to predicte distribution of species

Using the same list of occurrences with present and future bioclimatic variables (worldclim) I get two obviously different distributions. In the case of the future projection, I assume that the ...
Filippo's user avatar
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0 answers
323 views

Problem with definition of categorical variables in dismo package

I'm working with a package dismo: Species Distribution Modeling and I have all my environmental variables as categorical. I used "factors" argument as follow: mod <- dismo::maxent(x = ...
user1988's user avatar
0 votes
1 answer
152 views

How to generate one raster layer from multiple binary rasters for input in MaxEnt

I have multiple binary rasters (calculated from raster calculator) in ArcMap. Now, I want to convert them all into one raster. Mosaic and Composite tools of ArcMap seem not helping here. I am not sure ...
coder_001's user avatar
-1 votes
1 answer
1k views

How to process environmental data for the input in MaxEnt (or any other modelling platform)

I have downloaded some environmental rasters from Worldclim. Now, I want to generate an environmental layer for MaxEnt by applying conditions on those rasters. These rasters are 32 bit, floating point ...
coder_001's user avatar
2 votes
1 answer
2k views

Difference between Bootstrap and Cross Validation MaxEnt

I didn't know which method to use cross-validation or bootstrap in maxent so I ran both and my AUC values for each method are quite different for bootstrap I have an AUC of 0.758 and for cross ...
Chelsea_VictoriaS's user avatar
1 vote
1 answer
770 views

Calculating Euclidean distance in ArcGIS

I am willing to model the distribution of an amphibian species in relation to climate and land cover in MaxEnt. For this I have downloaded the WorldClim data and the Global Consensus Land Cover (https:...
psammodromus's user avatar
2 votes
1 answer
877 views

No Data was found error after applying a MaxEnt classifier (GEE)

I am trying to redo this tutorial: https://developers.google.com/earth-engine/classification, using the MaxEnt classifier with my data. Code: https://code.earthengine.google.com/...
farhat's user avatar
  • 151
3 votes
1 answer
593 views

Getting startAsciiWriting (x, filename, ....) error in R?

I am new to R. I am trying to transform elevation data in R for input into MaxEnt. Returned: Error in .startAsciiwriting (x,filename ...): x has unequal horizontal and vertical resolutions. Such ...
Kellie Goodhew's user avatar
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0 answers
2k views

Maxent error: Error projecting, two layers have different geographic dimensions

When I run climate data (signed 16 bit) and land use data (unsigned 8 bit) on Maxent, I got an error message: Error projecting: java.io.IOException: Files bio6 and alt in directory D:\WorldClim\...
Md Akbar Shah's user avatar
2 votes
1 answer
316 views

Extracting residuals of maxent model in R?

I used "dismo" package in R, and ran a build a maxent model. Now I want to extract the residuals from the model in order to run a Moran I test later. But I got an error. The code was like: xm<-...
Lili Li's user avatar
  • 113
1 vote
1 answer
48 views

How to create multi-scale variables from landcover data

I have calculated raster files with values of 0 and 1 for each landcover attribute I am interested in. I would like to make multiple raster files containing different cell sizes. e.g 100m2, 500m2, ...
Tom's user avatar
  • 13
1 vote
2 answers
6k views

Converting .tif to .asc for MaxEnt

I want to convert some .tifs to .asc to use in MaxEnt. I have tried using both ArcGIS 10.5.1 (the "Raster to ASCII" tool) and QGIS 2.14.3 (Raster > Translate tool). Both give .asc files, but when I ...
EcologyTom's user avatar
2 votes
0 answers
157 views

Points and bioclim layers plot correctly in R, but not in Maxent.jar

I am trying to use Maxent.jar. This program uses a CSV file of points and ascii bioclim layers (basically, a map of the Americas with climate data) and overlays them on top of one another. I find ...
TPegan's user avatar
  • 21
2 votes
1 answer
331 views

Can I consider as continuous data vegetation layers on Maxent?

I would like to know if we can consider as continuous data vegetal layers when disposed on seperate different .asc files (e.g.: Barren.asc; Water.asc; Evergreen Broadleaf Trees.asc; etc.)? The data on ...
Zack B.'s user avatar
  • 21
0 votes
1 answer
805 views

Running MaxEnt modelling in "dismo" using "loop" and storing the results in seperate objects and folders [closed]

I am doing a MaxEnt modelling using "dismo". I am using a loop to give multiple runs. I wanted to save results from individual runs in separate objects and at the same time the results from individual ...
Partha's user avatar
  • 31
1 vote
1 answer
2k views

java.lang.NumberFormatException: For input string: "-?"

I'm getting an error in Maxent which arises from one of the output files created by Maxent, in this case the _ASCII_novel.asc at row 159 column 444. However, the data in this position appears to be OK....
Morani's user avatar
  • 148
1 vote
1 answer
272 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 ...
Evan Bare's user avatar
3 votes
1 answer
1k views

How can I calculate averaged response curves for Maxent models fitted using maxnet package in R?

Could someone please point me towards an efficient approach? plot and response.plot (maxnet package) can produce response curves for individual models, but feeding a list of model replicates, as ...
Rainer Wunderlich's user avatar
1 vote
2 answers
2k views

dismo - Plotting individual predictor responses

I have a MaxEnt model implemented in dismo package. The package has the convenient function response to plot predictors' responses as the ones provided by the model html output, in R plotting style. ...
Quechua's user avatar
  • 337
1 vote
0 answers
121 views

'Spline' tool in ArcGIS Pro keeps dropping collinear points

I am trying to convert the WorldClim dataset from their original resolution of 30 arc-seconds (WGS1984) to 25m cells (OSGB British National Grid) for use in Maxent modelling. I clipped the ...
ArneL's user avatar
  • 21
2 votes
2 answers
1k views

Translating tif rasters to asc taking a long time

I need to use the 19 WorldClim variables in MAXENT, so I have to take the .tif files to .asc files using the translate tool. It's taking forever for me (2% after 2 hours). I've given up. I know its ...
srn's user avatar
  • 23
4 votes
1 answer
3k views

Maxent error 'java.lang.NumberFormatException: For input string:"Z^,,,"'

I converted a shp file into asc file in QGIS. Then I tried running the Maxent with that enviromental layer and came across that error message: java.lang.NumberFormatException: For input string:“Z^,,,”...
Idoia's user avatar
  • 43
1 vote
0 answers
250 views

rasterizing for maxent? [closed]

Im working with MAXENT and im having trouble using some shapefile files with critical variables. I rasterized the shapefiles into rasters selecting one attribute from the attribute table, but before ...
Dante Nahuel Ciai's user avatar
1 vote
2 answers
1k views

MAXENT and shapefiles?

I'm trying to make a Potential Distribution map for an animal species that, we think, should be dependent on edaphic variables. The problem is the only maps I could find with edaphic information are ...
Dante Nahuel Ciai's user avatar
1 vote
1 answer
332 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, ...
Asad Ali's user avatar
  • 141