Questions tagged [modis]
Questions about data from the Moderate-Resolution Imaging Spectroradiometer sensors aboard the Terra and Aqua satellites.
655
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Georeferencing JPSS-1/NOAA-20 L2 data (VJ109_NRT) with Python GDAL
I'm new to satellite image processing. I am working with a collection of VJ109_NRT - JPPS1 images. It is a L2 VIIRS product. They come with an extension .nc.
I have read the proposed documentation (...
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1
answer
18
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Use of convertmodis_gdal.convertModisGDAL
I tried to get ET and PET layer for MOD16A2 by using convertmodis_gdal.convertModisGDAL:
modisconv = convertmodis_gdal.convertModisGDAL(hdf, output, "(1 0 0)", 500, outformat='GTiff', epsg=...
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18
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Unable to find MOD11A1/A2 data for Pakistan in GEE
I need to analyze the LST products of MODIS, such as MOD11A1.061 and
MOD11A2.061, but I am unable to find any images for the KPK province of Pakistan for 2020 or even for 2021 or 2022. Why am I facing ...
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7
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Downscalling chlo-A concentration data of Modis Aqua with Sentinel 2 for Lake Tangayika
I'm trying to downscale chlo-A data of the Aqua Modis dataset in the region of Lake Tanganyika in order to study the environmental changes in the lake over the past 20 years. I didn't find any code ...
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10
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MODIS MOD13Q1 data time coverage problem
I downloaded modis MOD13Q1 data as shown below, which is 250m NDVI data every 16 days. But I'm not sure about the time range of this data. For example, 2014-01-17-NDVI data, does it cover the period ...
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1
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23
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I cannot export all image collection with image date for MODIS NDVI
While exporting images the namings are not setting properly with the image date. How can I solve the problem?
I have attached the associated code:
// Import the MODIS NDVI dataset.
var modisNDVI = ee....
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1
answer
29
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MODIS MCD641 quality bits from TIFF file in R
I have a TIFF file from MODIS MCD64A1 (burned area) which has a quality flag band with documentation like so:
I want to just select where bit 0 and bit 1 = 1 or where the flags are a land grid cell ...
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48
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Export Monthly Landsat NDVI Data from GEE
I am trying to export monthly MODIS Terra Daily NDVI data from Google Earth Engine (GEE). Despite researching various platforms, including this one, I find myself at an impasse. I attempted to ...
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17
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Doubt on using reducers with MODIS sinusoidal projection in Google Earth Engine
I am trying to extract the MODIS NDVI value for the pixel closest to a given point using the Python implementation of Google Earth Engine. The point is defined from Google Earth Coordinates (so WGS84) ...
- 275
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70
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Combine and reduce land cover and MODIS collections with different IDs
I need to add the information from Land cover Image Collection (2015-2019) to MODIS Image collection. In practice should be merged fuve land cover images with MODIS images for the whole five year long ...
- 29
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26
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Saving/Exporting Image Collection to asset in GEE
I am using MODIS image collection for irrigation mapping. Due to the outliers present in the MODIS dataset I applied Savitsky Golay filter in that image collection. And when doing other operation on ...
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23
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Area calculation of MODIS snow cover
I am trying to Calculate NDSI Snow Cover Area in Percentage and Square Kilometers. But It code not working for me. Code giving me this error, "Error: Image.select: Pattern 'year' did not match ...
- 101
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69
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Generating a CSV table with daily SPM data in Google Earth Engine
I'm trying to generate a CSV table in Google Earth Engine to obtain daily data of Suspended Particulate Matter (SPM) concentration in different locations over a defined period. However, when I run my ...
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143
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Calculating ET using MODIS product in GEE
I extracted monthly ET values using MODIS product (MOD16A2 Version 6 Evapotranspiration) in Google Earth Engine. I multiplied the pixel values with the scale factor of 0.1 as identified in the ET band ...
- 1
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89
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Process multiple MODIS HDF images iteratively in R
I have various files of MODIS MCD43A3 Version 6.1 (lpdaac.usgs.gov/products/mcd43a3v061). The files are in HDF format. I am using following code in R to change the sinusoidal projection of MODIS files ...
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1
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108
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Earthdata log in error for downloading MODIS data (R language)
I feel like I have followed all the correct steps on what is listed online here is my code: (and of course I have my correct earthdata username and password listed).
setwd("~")
library(MODIS)...
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22
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Is it possible to make a True Color RGB with 2 VIS band and one IR band?
I want to create a True colour RGB. I am working with MODIS L1 images. For some circumstances, the only bands that I have available are:
Band 1 (620 - 670) (VIS)
Band 2 (841 - 876) (VIS)
Band 22 ...
- 1
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0
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45
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Download MODIS product for the whole globe with R
I need information about global vegetation index (EVI) and GPP, derived from MODIS satellite data. To download the data, I've tried using both the MODIS package and the MODIStsp package in R, but it ...
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1
answer
276
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Comparison between two images with different projections using GDAL
I am pretty new to GDAL, and I want to compare two data sets with different projections, specifically a MODIS L2 product and a simulation--both having their longitude/latitude and environmental ...
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150
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Calculate total burn area using MODIS Burned Area Monthly Global 500m
I want to calculate the total area burnt in a specific region within a year. I am using MCD64A1.061 MODIS Burned Area Monthly Global 500m for this. Since the data is available on a monthly basis, I ...
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1
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67
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ComputedObject (Error) Error in map(ID=2015_01_05): Image.constant: Parameter 'value' is required
I would like to get 5 to 95 percent Day_1km_LST from MOD11A1, but it show this error:
ComputedObject (Error) Error in map(ID=2015_01_05): Image.constant:
Parameter 'value' is required
The Google ...
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32
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Number of pixels in AOI using Google Earth Engine JavaScript API
I'm trying to calculate the fraction of snow cover and compare it to a time series.
For this I need the total number of pixels with and without snow in an area of interest.
I can get this # of pixels ...
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1
answer
76
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Creating Monthly Mean Composite of LAI using Modis Dataset
I am trying to calculate the monthly LAI composite, but somehow code is not working. Need Suggestions? It shows this error, Line 36: image.get is not a function.
// Define the start and end dates
var ...
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1
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56
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GEE cycle if for skip the null value from Modis "'Day_view_time'" band
I trying to take the time value from Modis band and convert it from local solar time to UTC. After I need to concatenate it with date which I take from system;time_start and print all statistics. ...
- 29
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1
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51
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Python and GDAL. Missing a dimension when using .ReadAsArray()
I'm using MODIS satellite data and I'm loading the data into Python using the Python bindings of GDAL. I want to extract an array of a specific variable with dimensions 7x8x180x360. They are joint ...
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1
answer
60
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How to extract LST from different points with its coordinates in google earth engine
I am trying to get from different points the LST values. The code works, however, I am not able to identify from which point it is extracting the values. I am trying to get the header of each point ...
- 23
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57
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MODIS Aerosol Data Projection
I have been trying to work with MODIS Aerosol Products, namely MOD04_3K. For a sample HDF file from the LAADS DAAC cloud, I am extracting Latitude, Longitude and AOD data using the following code:
...
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46
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Export MODIS MOD16A2 data from a graph in GEE to a CSV file directly on the google Drive
How can I export the average MODIS AET values for an ensemble of points defined by a shapefile, obtained as a graph using GEE, directly to my Google Drive in CSV format? I have attempted to use the &...
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45
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GEE, error plot SNOW cover areas
I want to plot the maximum snow cover areas using MODIS, for that I am following the answer to a similar question someone asked months ago Link
But I have an error in the areas plotting section, this ...
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1
answer
61
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Interpreting quality mask in MODIS snow cover data
I am struggling to understand the masking logic for MODIS snow cover data in the image selected in the code below (and many others like it).
In the image:
The black areas are "best" ...
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20
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Cannot calculate max month value and download images of Modis in partal mouths of 2001 and 2002
I cannot calculate max month value and download images of Modis in partal mouths of 2001 and 2002. There will be something wrong in partial months in 2002 with no vale of NDVI and images. I thought ...
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203
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Unable to transform edge error when clipping ImageCollection in Google Earth Engine
I am attempting to clip an ImageCollection in GEE, but I keep getting the error
"Unable to transform edge (43200.000000, 1.476288 to 43200.000000,
1.477361) from SR-ORG:6974 PLANAR [926....
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1
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38
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Why my NDVI animation using GEE is strange
I would like to show an NDVI animation of some Amazon area to demonstrate the deforest effects.
Here is my high-level code.
Get the NDVI from MODIS data and only use the images from Sept and December ...
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71
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Terra Net Primary Production(NPP) data absent
I am working with MOD17A3HGF.061: Terra Net Primary Production Gap-Filled Yearly Global 500m (ee.ImageCollection("MODIS/061/MOD17A3HGF") dataset for determining NPP. My study area is "...
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1
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139
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Using ee.Reducer on monthly time series with missing data
I am trying to generate a value of mean MODIS LST for each month in a time series for a feature collection, as well as an overall timeseries minimum and maximum LST for each month of the year. When I ...
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192
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Multiple linear regression analysis with MODIS EVI (dependent variable) against LST, precipitation and elevation (constant) in Google Earth Engine
Assessing the response of phenology (using EVI as proxy) to changes in temperature and precipitation along an altitudinal gradient from 2001 to 2022. One of the ways I am trying to achieve this is by ...
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100
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Calculating VCI index from "MODIS/006/MOD13Q1" data
I want to calculate VCI index from "MODIS/006/MOD13Q1" data. But I couldn't find a code to calculate it. I have code that calculates NDVI from this data.
How can I calculate VCI Index from ...
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1
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24
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Raster calculations with iteration
I have two sets of raster images, how can I do some raster calculations with iteration?
For example, I got TERAA and AQUA land surface temperature(MOD11A1/MYD11A1) images on the same date, and there ...
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46
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Converting MOD11A1 daily LST to 16 day composites
Trying to do a linear regression with MODIS 16-day composite NDVI (MOD13Q1) as the response variable and MODIS LST (MOD11A1) as the predictor variable. The relationship will be calculated by randomly ...
- 77
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1
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260
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Export yearly median MODIS/061/MOD13Q1-based products using Google Earth Engine
I am trying to export yearly median MODIS-based NDVI products at 250m spatial resolution. I am using the 16 day MODIS/061/MOD13Q1 product. I have found this code which I am following.
The yearly ...
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48
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Google Earth Engine MODIS phenology histogram error message "Error generating chart: Array: Parameter 'values' is required."
Srni and Modrava are both polygons I created on the map in a national park. I am getting this error message: Error generating chart: Array: Parameter 'values' is required. Anyone knows how to fix this?...
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2
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54
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Pixels not matching with GDAL projection of Modis LST hdf data [duplicate]
I have used the following the commands to project MODIS LST .hdf data through GDAL in cygwin:
gdalwarp -r bilinear -of GTIFF -tps -t_srs '+proj=utm +zone=29 +datum=WGS84' HDF4_EOS:EOS_SWATH:"...
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1
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197
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Parsing MOD13Q1 QA layer using Google Earth Engine JavaScript API
Working with Modis MOD13Q1 data and I am not sure how to correctly parse for pixel QA and DetailedQA.
// Call data
var CRNP_Oban = ee.FeatureCollection("users/sijehasuk/CRNP_Oban2"),
...
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1
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1
answer
276
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Summarise 16-Day Modis image (MOD13Q1) into mean yearly value in GEE
I am new to GEE (about two weeks) and trying to understand the response of NDVI (as proxy for phenology) to temperature and precipitation in the Oban forest of Nigeria. I am using MOD13Q1 (250 m), ...
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1
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143
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Add to map only certain types of MODIS Land-Cover In Google Earth Engine
I'm trying to create a map on Google Earth Engine with only some Land-Cover class, but I can't find a solution to this problem.
I'm using this MODIS dataset: MODIS/061/MCD12Q1/2002_01_01
I'm using ...
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1
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2
answers
524
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Use the .map() function of Google Earth engine between two different images within the same image collection
Context
I am using the MODIS layer. I divide the layer into classification bins and would like to assess change between two consecutive years (e.g., year 2005 to year 2006) for the years 2000 to 2020 (...
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210
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Charting multiple image collections on same plot in Earth Engine
So I'm attempting a correlation chart aiming to correlate four parameters -- LST (MOD11A1.006), NDSI (MOD10A1.006), NDWI (MCD43A4.006), AOD (MCD19A2.006) and plot them on the same chart. I've been ...
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59
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How to display MODIS QC resulting images in Python
It's the first time I'm working with MODIS data. I have executed the Juanma Cintas and Nikos Alexandris's below code, but I don't see the code to plot the result images.
Are these below codes ...
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56
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Recommendations for dealing with huge raster data in QGIS
I want to receive information about the number of pixels by category in a multi-polygon using NASA's MODIS landcover dataset. I would use QGIS's raster histogram operator to do so. The polygons are ...
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149
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Reprojection of TIFF data with unknown projection in python
I am trying to reproject a tiff file from MODIS in unknown sinusoidal projection to wgs84. I found a script here
from osgeo import gdal
# Change the following variables to the file you want to convert ...
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