Questions tagged [modis]

Questions about data from the Moderate-Resolution Imaging Spectroradiometer sensors aboard the Terra and Aqua satellites.

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10 views

Comparison between NDVI/EVI from Landsat and MODIS [closed]

I know that the NDVI/EVI images from Landsat have a higher resolution (30x30 km²) than those from MODIS (250x250 km²). Does it mean that NDVI/EVI images from Landsat are better than images from MODIS ...
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13 views

Downloading EVI data for every 5 days

I am working to download the MODIS data for every 5 days for one specific area. Is there any ways to download it by once but not manually select every 5 days? I have tried download from EO browser and ...
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1answer
30 views

Creating feature collection after importing different shapefiles from assets in Google Earth Engine

I am importing 2 different shapefiles from assets to plot the time series chart of MODIS but I am unable to make the feature collection out of these shapefiles how to do that? // 1st Shapefile var ...
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34 views

GDAL changes pixel resolution when transforming from HDF to netCDF

Using the MODIS product MCD18A1.061 (DSR 1km), tile h15v05-2001001, my goal is to extract the scientific datasets that are contained in an HDF to several netCDFs. For this, I used the following gdal ...
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1answer
39 views

NDVI Modis Times Series Animation - GEE

I don't understand JavaScript. Following the instructions, I made a beautiful animation with following code: var geometry = ee.Geometry.Polygon( [[[21.171108568177974, 52.71072901884085], ...
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26 views

Cloud-masked MODIS Albedo in Google Earth Engine

I would like to extract the Albedo values at a certain point. I found an answer in a Stackoverflow post to help my problem and adjusted it. However, I cannot manage to get the cloud-masking to work ...
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27 views

Storing NDVI values from MODIS datasets in variables in R

There is a MODIS dataset called MCD14ML (collection 5), which contains some information about observed hotspots. In particular, I'm working with a subset of the dataset that is concerned with hotspots ...
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10 views

Convert MODIS_Sinusoidal into WGS84 in ArcGIS Pro

This is how the. tiff looks when I add it into ArcGIS Pro I'm new to ArcGIS pro and coordinate system. I export the MODIS land cover data from Google Earth Engine, but when I import this into ArcGIS ...
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33 views

Extracting NDVI values from MODIS datasets in R

Firstly, I'll provide a bit of context behind my question. I've been reading a paper about bushfire modelling, and the paper uses the MODIS datasets (this is my first time learning about them). In ...
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13 views

Extracting MOD44B Percent Tree Cover 250mx250m tile data for 38 districts with polygons

I am working on Billion Tree Tsunami Project in Pakistan. I want to extract PTC data for each tile of 250mx250m with polygons. I have district-level polygons. I have run a code but it gives me ...
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14 views

Warp MODIS Blue Marble Projection to EPSG:102009 QGIS

I have been trying to reproject the land_shallow_topo_west.tif file for MODIS from the following site: https://visibleearth.nasa.gov/images/57752/blue-marble-land-surface-shallow-water-and-shaded-...
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1answer
20 views

Extracting NDVI values from hdr file

I have a dataset of hdr files of MYD13A2 MODIS product including 4 bands NDVI, EVI, quality, and reliability. I want to extract the NDVI values for a group of points; I have the geographic coordinate ...
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46 views

Google Earth Engine large reduce resolution and reproject fails to export to drive

I'm attempting to aggregate (reduceResolution) a higher resolution image (e.g. 30m global forest loss as in code below) to a lower resolution image (e.g. 1000m pixels), based on some criteria, with a ...
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1answer
41 views

Problems filtering MOD09A1 in GEE using the QA layer

I'm trying to mask each modis image using the QA layer. As far as I understand, the part .select("QA").eq(0) should remove all pixels with no ideal quality for all bands. However, when I ...
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1answer
42 views

Resample of mean of ImageCollection to higher resolution

I want to resample the mean of 48 images of GPM with 10000m to MODIS in GEE. My code works perfectly for one image but the result for the mean or median of 48 images (or any number) does not correct. ...
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39 views

Using MOD16A2 in GEE to extract best quality of PET

I am beginner with Google Earth Engine programming. I want to know how I can use MOD16A2 to extract good quality values of potential evapotranspiration data (MOD16A2)? because I extract the PET of ...
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32 views

Calculating adjacent temporal days (ATD) by iteration using Google Earth Engine

I need to make a classification to eliminate the snow cover, for this we are following the ATD method of Gafurov, in which we observe 1 day before and 2 days after on a given pixel or vice versa, in ...
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37 views

Snow line in Google Earth Engine [closed]

I am new in Google Earth Engine and need help to make the snow line on a merged product of MODIS for aqua and terra. So far, I made the function, union, threshold for NDSI to be greater than 0.4 and a ...
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28 views

Loading Coordinates without shp file but prj, cpg, hdf, xml

I want to import the grids for pixel tiles of a MODIS data set and received the data for that from someone else. However, it does not contain a .shp file but only .prj, .cpg., .hdf and .xml. Is there ...
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17 views

Google Earth Engine: error using uploaded shapefile to subset MODIS image collection

I am trying to run the following script to calculate the mean vegetation condition index (based on MODIS NDVI data) for a single district in Ukraine (Tokmatskyi). I imported the shapefile for this ...
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112 views

How to loop through each feature in a shapefile in Google Earth Engine?

I have written a script which calculates the mean NDVI, NDWI, and NDDI (Normalized Difference Drought Index) values for a given county in a specified time period. These values are then outputted to a ...
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41 views

gdal_translate: unknown displacement after transformation

I am new to GDAL and after a lot of research I cannot find a solution to my problem. I want to extract a Scientific DataSet (SDS) from an HDF file, but when I do this with gdal_translate there is a ...
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1answer
39 views

Google Earth Engine - error in function to plot seasonal vegetation index for a region using MODIS data

I am trying to create a function to calculate the average Vegetation Condition Index ((mean NDVI of individual year)-(min NDVI from full period)) / ((max NDVI from full period) - (min NDVI from full ...
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2answers
69 views

Converting sinusoidal to WGS - MODIS TIFF file too big with R

I am interested by MODIS product. I've converted HDF file to TIFF with R and gdalUtils. I used a method similar to this : https://stackoverflow.com/questions/36772341/reading-hdf-files-into-r-and-...
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8 views

Filling missing LST values

I wrote a code to retrieve LST values from a certain point. I am getting results but have NULL value as well, maybe due to cloudiness and ... I want to fill those gaps. Does someone have a running ...
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40 views

Error when downloading a reprojected image from 30m EPSG: 4326 to 250m SR-ORG:6974 at global scale in Google Earth Engine

I am trying to export an image (global scale) and I get the following error: Error: Reprojection output too large (117761x1982 pixels) The aim of the code is to download an image showing the % of ...
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1answer
342 views

How do I run Panoply (from NASA GISS) on Windows 10?

I am unable to run Panoply (from NASA GISS) to view NetCDF files. When I try to run it, it tells me that I need Java Runtime Environment 9, but the latest version of JAVA from the Oracle website is 8....
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1answer
18 views

Issue using pyModis.createMosaicGDAL() on Debian

I'm currently trying to automate some data processing with MODIS data using pyModis but am running into an odd issue. I've developed a script that I've run locally just fine. It downloads all the ...
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1answer
36 views

How can I automatically deselect a mapped layer in Google Earth Engine?

I am currently mapping land cover changes between two years, e.g. 2001 and 2010. The code I am writing adds the Land Cover layers to the map for both years, so a map of 2001 and one of 2010. Then, I ...
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1answer
35 views

How to change the extent of a similar raster in QGIS?

I have two MODIS evapotranspiration rasters and their information is given below. Desirable raster extents: Erratic raster extents: I want to change the erratic raster extent to desirable raster ...
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1answer
62 views

How to get URL download in Google Earth Engine?

In the below code I want to download PM image using getDownloadURL instead of Export.image.toDrive() but returns error. How can I solve this problem? code link: https://code.earthengine.google.com/...
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1answer
37 views

Metadata Error in Google Earth Engine?

In the below code time band doesn't create for merged collection. I don't know why but it returns metadata error: code link: https://code.earthengine.google.com/3827c156af430c2485aedf28f9273206 Map....
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1answer
16 views

Different pixel value between gdalwarp and ENVI classic in MODIS

I succeed running gdalwarp in level 1 MODIS data. The data in : https://1drv.ms/u/s!AjXAWS5maHffhxx_Pf2j2snnXocs?e=ceHHcd When I run gdalinfo, the partial information is like this : $ gdalinfo a1....
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1answer
28 views

Google Earth Engine only clipping the boundary of polygon?

My code is var study_area = ee.FeatureCollection('users/new_external_boundary'); var study_area_ = study_area.geometry(); var dataset = ee.ImageCollection('MODIS/006/MCD12Q1'); var igbpLandCover = ...
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6 views

Confusion about “alpha” band for MODIS Aqua

I'm working with modis:09:CREFL data for a harmful algal blooms paper, and I am trying to figure out how to call the chlorophyll-a band, which I believe is the "alpha" band, but I'm not sure ...
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28 views

MODIS HEG tool - integerized_sinusoidal projection not supported in swtif for MOD021KM

I tried to use the swtif command line in HEG tool to convert the MOD021KM swath to standard sinusoidal grid. Since the standard sinusoidal projection is not supported in the version of 2.5, I used the ...
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17 views

Seeking Moderate to High Resolution Forest Fire Before and After Images

I'm trying to search through the moderate to high-resolution satellite image data sets for imaging that shows forests both before and after a forest fire in order to assess the burn severity and the ...
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30 views

How to resolve the error while downloading MOD10A2 image using MODIS package in R?

I am trying to download the MOD10A2 image using MODIS package in R However, each time it is failing with following error Error in sf::gdal_utils(util = "warp", source = gdalSDS, destination ...
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2answers
126 views

GRASS GIS: r.in.gdal does not find raster data in .hdf file (modis data)

I'm having trouble in importing MODIS .hdf data in GRASS GIS. When I use r.in.gdal it returns me this error: ERROR: No raster bands found in </Volumes/Maxtor/TESI_satellite_imagery/...
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57 views

MODIS data download issues with runGdal in R

I'm trying to download some MODIS data using the following function, which errors like so: ndvi.evi <- runGdal("MOD13Q1", collection = "006", tileH = 20, tileV = 11, ...
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25 views

No download Option

I am using Modis-13A2 in USGS earth Explorer but I am unable to download its GeoTIFF file because download option is not available kindly guide me. ]1
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1answer
86 views

Time Series Extraction of Modis LAI product (every 3 days a new satellite image) in small study area

At the moment I am struggling with a time series and the extraction of MODIS LAI data. I am using the band "Lai" from MODIS/006/MCD15A3H. My study area is small, so presumably, since the ...
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13 views

How to traverse all Landsat 8 pixels in each MODIS pixel space on GEE

I have two scenes of Landsat 8 and MODIS images in a designated area. I want to traverse all Landsat 8 pixels within the space of each MODIS pixel. How should I deal with this?
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43 views

Download global data efficiently from Google Earth Engine

I want to get the GPP of MODIS from Google Earth Engine on a global scale, here is my code. var start_date = ee.Date.fromYMD(2000,1,1); var end_date=ee.Date.fromYMD(2005,1,1); var Date_window=ee....
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17 views

Using MODIS .act file

I previously downloaded a file named modis_lst.act from MODIS land surface temperature page somewhere. It seems to be a pallete (or colormap) thing. How to parse and use this .act file? Or, in other ...
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123 views

Different results extracting data from the same point from MODIS HDF with R

I am trying to extract NDVI data from MODIS HDF files using R. I have several files downloaded from EarthData. The file I am using in this example is here to download. These MODIS HDF files have a ...
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113 views

Get daily mean of AOD from MCD19A2 in GEE

I tried to get daily mean of AOD from MCD19A2 in GEE, but my mean function always returns zero. // function to add date to image collection from system:time_start var writeDate = function(image){ ...
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22 views

Reproject MOD13Q1 in GDAL using the gringpoints

I am working with the MODIS MOD13Q1 vegetation product and the reprojection using gdal is fine, however I wish to be more precise and use the GRING to accurately warp the data into wgs 84(epsg:4326). ...
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1answer
39 views

Making Images in Collection Binary Based on Threshold

I am trying to make every image in a collection into a binary image based on whether it's band's pixel value is higher or lower than a certain threshold. For instance, if an image's pixel in a ...
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22 views

R SPEI package on waterbalance timeseries for multiple locations with NA's: unexpected data output distribution

I want to use the spei() function in the SPEI package on a waterbalance dataset from 2015-2020 of 99 locations. The waterbalance is calculated out of MODIS PET values (8-day summed to monthly) and ...

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