Questions tagged [modis]

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

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Calculating monthly Modis NDVI using GEE Python API applied to one or multiple regions and exporting results to Pandas DataFrame [closed]

I want to obtain a monthly-year time series of the NDVI inside certain region defined by a polygon. I think I could made it using JavaScript. But I would like to translate to the Python API. I'm a bit ...
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Reproject Data on to WRF grid

I have MODIS data EVI and LSWI which I want to fit to WRF grid which in LCC projection system, I can read specification using CEN_LON, LAT1, LAT2. Based on that I have reprojected my TIFF files using ...
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How to create a list with the classes values in a raster?

Let's say that I have a hypothetical study region and I just want to create a list object with all of the LULC classes within that region. How can a get it? I got, for example, a MODIS LULC: var ...
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Uploading multiple Aqua/MODIS files (NetCDF format) into QGIS in one action to convert into raster files

I have 70+ Aqua/MODIS files (NetCDF format) representing sea surface temperature (SST) that I want to upload into QGIS in one action to convert each file into individual raster files (i.e. 70+ raster ...
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Image Collection Join Error in Google Earth Engine

In the below code, I want to join two image collections based on system:time_start property but it does not work and returns 0 element. Collections acquisition dates are same but they are different in ...
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QGIS: Multi Overlay Analysis of NetCDF-4 Raster Files to Calculate Average Values over 5 years

Issue: I have a dataset that ranges from 2016 to 2021. The file types that I am going to use for the analysis are Aqua Modis and NetCDF-4. My data contains 650 rows and I am using parameters such as ...
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Removal of location names

I am using the FireCCI51: MODIS Fire_cci Burned Area Pixel Product, Version 5.1 dataset on Google Earth Engine and wondered whether there was a way of removing place names from my image or overlaying ...
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User memory limit exceeded in Google Earth Engine

I am trying to resample the MODIS evapotranspiration product from 500m to 30m. I am using the following code: var MODIS_data = ee.ImageCollection('MODIS/006/MOD16A2') .filterBounds(...
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43 views

Empty map error for MODIS NDVI time series on Google Earth Engine

I am trying to get a time series of MODIS NDVI for a point, with the script below and it works quite well, except when I try to include the year 2017 where I get the following error message: ID: ...
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Reducing MODIS MOD16A2 evapotranspiration over a season

As per IMD, there are 4 seasons over India which are viz winter (January-February), pre-monsoon (March-May), summer monsoon (June-September), and post-monsoon (October-December). GEE Javascript API ...
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How can I know if I'm using terra or aqua satellite

I'm using the MOD09GA product (mainly using band 6). I want to work only with the data from the Terra satellite; how can I know if the image is Terra or Aqua? I looked in the MODIS Surface Reflectance ...
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657 views

Getting 'xml.etree.ElementTree.Element' object has no attribute 'getiterator' error when run createMosaicGDAL.run

I am using pyModis to mosaic some tiles of MCD12Q1. I have downloaded the dataset and I am trying to mosaic those tiles. from pymodis.convertmodis_gdal import createMosaicGDAL files = glob.glob(os....
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57 views

Error: "Parameter Element is Required" in Google Earth Engine?

In the below code I want to put elevation average values in to the list but returns error: code link: https://code.earthengine.google.com/6337849ec707ae2e229ba4bdb02e5fff var startDate = '2000-01-01';...
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MODIS MOD09GA product B6 "stripes"

I'm trying to work with the MODIS surface reflectance data of B6. I'm have downloaded the MOD09GA product, and the image format is HDF. It seems that all the images present "stripes" on B6. ...
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Image Plane or Object Plane Scanning Satellite Instruments

Scanning systems can be classified as either Image Plane or Object Plane, depending on where the light rays converge, as shown in the following figure. I would like to know if the Terra MODIS, ...
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How to mosaic multiple rasters (MODIS data) in R programming

I've four tiles of MOD16A2 dataset, I want to mosaic them using following script in R. filez <- list.files(path = getwd(), pattern = ".tif") r.list <- list() for(i in 1:...
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MODIS area burned by day of year using Google Earth Engine

I'm trying to use Google Earth Engine (Python API) to calculate area burned using the MODIS area burned dataset; specifically I want daily area burned (for a single year) over a particular area of ...
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Accumulation Function Error in Google Earth Engine?

The below code is going to calculate accumulative temperature by adding each image to the previous ones. Despite it works and plots values but csv file shows many dates have been missed before. Does ...
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1 answer
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Add Each Image to Previous Image in Google Earth Engine Error?

The below code has written to add each image to the previous image using iteration function but I don't know why returns negative values while positive expected! Code link: https://code.earthengine....
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46 views

GEE: export image collection to google drive

I am completely new to GEE and want to obtain Modis burned area product for the years 2017-2020 as tiff-files. I worked out this code, but when I run the code it says in the console: object.name is ...
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Using band threshold to modify value of another band in Google Earth Engine

I've recently been working on MODIS' ice product, and I want to use whether the value of the band by class is equal to some specific value to determine whether the band by NDSI is 0 or 1.codes as ...
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1 answer
336 views

Google Earth Engine extract values on MODIS data at point coordinates

I'm trying to extract from the MODIS collection MOD11A1006 band "LST_Day_1km" at one point coordinates the value of each image in the collection together with the date, and hour of the image ...
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1 answer
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Why do strips appear on remote sensing images?MCD19A2.006: Terra & Aqua MAIAC Land Aerosol Optical Depth Daily 1km

When I was implementing a multi-year average for an area with Google Earth Engine, I found that the generated images appeared to be striped.Generating one day, one month, and one year of AOD_055 mean ...
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29 views

Raster aligned but distorted in ArcGIS Pro

I have mapped a raster image (.tif) from a MODIS image collection in ArcGIS Pro and would like it to align with a polygon (red). However, the image seems to be slanted, which I assume is a projection ...
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121 views

How to interpret "AOD_QA" layer of MCD19A2?

I read hdf data using MATLAB, qa = hdfread("MCD19A2.A2003060.h28v04.006.2018018233855.hdf","AOD_QA"); According to page 13 of the user guide (MODIS Multi-Angle Implementation of ...
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MODIS Land Surface Temperature hdf to tiff - problem with lst values after reprojection

I have a folder with MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid V061 hdf files (downloaded from NASA's Earth Data Search). I want to use the following script that I ...
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Why do these MODIS images look so different?

Why do these 3 MODIS NDVI images have such different shades of grey? The middle image has so many dark spots and the last one is also somehow not the same in terms of shade. All of them have been ...
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Google Earth Engine: problem with areal calculations on MODIS data

While trying to calculate forest coverage per country with MODIS/006/MOD44B and LSIB data, I get the following error: FeatureCollection (Error) Unable to transform edge (89589.000000, 86393.171875 to ...
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No difference between Savitzky-Golay 2nd order and 3rd order polynomial curve

I don't understand why there is no difference between Savitzky-Golay 2nd order and 3rd order polynomial curve? Perhaps the 3rd order polynomial curve is overfitted, not sure but the concern is yet not ...
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1 answer
42 views

Why does aggregation of MODIS pixels not sum to 1?

I want to find the fractional cover of different tree species from MODIS (30 m resolution). I use R to stack, aggregate (1020 m resolution) and thereby find the fractional tree species cover for a ...
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1 answer
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Do you need to account for the sinusodial projection when working with MODIS?

I am currently working on a project where we analyse the vegetation cover of the whole of Canada and the US. We have used MODIS data. Only now did I read that the usage of MODIS data leads to possible ...
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2 votes
1 answer
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Why does "divide calculator" generate the same value for all pixels?

I would like to calculate the simple ratio (SR) using NDVI, SR=(1+NDVI)/(1-NDVI). And the result shows that all of the pixels have the same SR value. I checked the NDVI data is correct. //Upload ...
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Converting sinusoidal projection into WGS84 lat and lon values using MATLAB for MODIS file

I have a MODIS HDF file, MCD19A2 product. The files are stored using sinusoidal projection for a tile. A tile is then divided into 1200 by 1200 grids (or in 1200 by 1200 matrix, you can say). The ...
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Problem Exporting entire ImageCollection in Google Earth Engine (agrimask_2001)

I'm trying to export to the drive all the images within a MODIS satellite collection. I came across this question, which is given exactly the answer I need: link: Exporting entire ImageCollection in ...
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221 views

Generation of snow cover area time series in GEE using MODIS Snow Cover product

My aim is to resample MOD10A1/MYD10A1 to the same scale as that of MOD11A1/MYD11A1, mask the image collection to obtain the best pixels, and finally to obtain the time series plot of the total area ...
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Download pixels where "1 < BurnDate < 366" from MODIS Burned Area

The following code downloads 3 band burned area rasters for each month in the defined range. I am only interested in the pixels in the 'BurnDate' band, which have values between 1 and 366. I wish to ...
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2 votes
0 answers
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Download MODIS burned area from Google Earth Engine [duplicate]

I'm trying to download the MODIS burned area data from GEE, however when I do I get Error: Image.setDefaultProjection, argument 'image': Invalid type. Expected type: Image<unknown bands>. Actual ...
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  • 313
2 votes
2 answers
47 views

Relation between Solar Radiation and Elevation: Satellite Data

I used DSR (Downward Shortwave Radiation) data from MCD18A1 product and GHI (Global Horizontal Irradiation) data from SOLARGIS to create solar maps: Using this elevation map: I see that the solar ...
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TIMESAT seasonality values different orders of magnitude

I'm using TIMESAT 3.3 to find the seasonality parameters of a specific part of Ontario, using both the ASCII and image input methods. I've used the ASCII input method for specific points in the area, ...
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TIMESAT raw .tts not found

I'm using TIMESAT 3.3 on a Windows 10 computer. I'd like to use TSM_viewfits to see the original raw data and the fitted data for a processed ASCII file, but I do not have a .tts file containing my ...
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1 vote
1 answer
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How to use MOD11A1 bitmask to select "Good Data Quality" pixels for further LST time series generation in GEE

I'm trying to generate a daily LST time series over a region by selecting only the good quality pixels. The code I've written is attached below along with the dataset description. My aim is to select ...
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1 answer
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How to calculate VCI index in GEE?

I would like to calculate the VCI index from MODIS/006/MCD43A4 NDVI over the months July and August for the period 2002-2017. I have the following code, but I do not know how to continue. var ...
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2 votes
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Does Google Earth Engine (GEE) compute Vegetation Condition Index (VCI) time series correctly?

The formula to compute VCI from long term dataset is VCI= (NDVI_current-NDVI_min)/(NDVI_max-NDVI_min) * 100, refer to Drought monitoring using the Vegetation Condition Index (VCI) Map.centerObject(...
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MOD04_L2 data processing in r

i am new to using r, so i excuse in advance for asking basic question. I have been trying to convert MOD04_L2 data into GeoTIFF and extract value to a district shapefile in R. the coding seems to work ...
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1 answer
115 views

Counting pixels in region in EarthEngine is drastically affected by "scale"

I am trying to obtain a count of how many pixels (data points, or measurements) there are in the MODIS dataset (chlor_a band) in a specific region in a period of several months. The problem is that ...
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Calculating blue sky albedo with MODIS & Google Earth Engine

I am trying to calculate the blue sky albedo, which I think is the same as land surface albedo, using Google Earth Engine and the 'MCD43A3.006 MODIS Albedo Daily 500m' data. I've managed to find ...
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Calculating yearly cumulative burned area in GEE, nested function issue

Given the monthly Modis Burned Area product, I am trying to get an annual sum for each year for multiple polygons. I wrote a function to map over each of the basins and then nest it within a function ...
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Exporting a stack image from Google Earth Engine to drive results in a very small file

I am trying to export a stacked land cover type image (24 bands) from the MCD12Q1 product (MODIS Yearly Land Cover Type) clipped to my Area of Interest (Rwanda). I am using the following code: // ...
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MODIS Downscaling Error in R?

The below code uses DEM to improve MODIS spatial resolution by raster and spatialEco libraries but returns this error: Warning message: In raster.downscale(landsat, modis, scatter = TRUE) : ...
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1 vote
1 answer
494 views

Downloading AOD values using Google Earth Engine

I have been working with GEE to get retrievals AOD values from MCD19A2.006: Terra & Aqua MAIAC. I've seen in some code that I can give it a scale, or the best pixel quality to download data. But ...
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