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Questions tagged [modis]

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

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38 views

minimum number of pixel points for regression on atmospherically corrected satellite images

I am performing atmospheric correction on a Landsat 8 image using different methods to check which one works best (in order to proceed with further/subsequent analysis). Wondering if it's okay to use ...
2
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1answer
79 views

How to determine the appropriate size of a 3 dimesional raster block/chunk

I am processing large MODIS time series (12 years) dataset with an array dimension of 4800 x 4800 with a data type of Int16-Sixteen bit signed integer. I want to build a 3 dimensional array (row,col,...
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0answers
323 views

TIMESAT seasonality data (MODIS EVI)

I am trying to get seasonality parameters from MODIS EVI (MOD13Q1) for Indonesia. I have loaded data from 2013-2015, but the plotted time-series is shifted from what I expect. Indonesia has rice-...
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0answers
200 views

16-day-MODIS NDVI values seem to be wrong compared to my soil moisture ground data!

I'm using MOD13Q1 product of MODIS for estimation soil moisture. As I know, this product is made up of the maximum value of NDVI of each pixel over 16-day calculated NDVI values. The problem is that ...
2
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1answer
218 views

Strange behaviour of MODIS 17A3 NPP values when converting from .hdf (downloaded files) to .vrt to .tif in QGIS

I was hoping someone could help explain a behaviour that I noticed while working with downloaded MODIS 17A3 .hdf files from here: ftp://ftp.ntsg.umt.edu/pub/MODIS/NTSG_Products/MOD17/MOD17A3/ The ...
2
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0answers
190 views

Application of a Piecewise Logistic Function to Extract Seasonality Metrics

I am working with 16-day MODIS EVI (satellite) data and I want to fit a Piecewise Logistic Function through my 23 EVI data values. The following formula is for the Piecewise Logistic Function: y(t)= [...
2
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0answers
136 views

Flood extent extraction from satellite images

How can I extract the floodwater from satellite images? Is the image classification method accurate for moderate-resolution satellite (Terra/Aqua MODIS)? Or are there more accurate methods?
2
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0answers
814 views

Processing MOD35 cloud mask image?

I have a question about processing MOD35 cloud mask image. I worked reprojection on MOD35 cloud mask image using MODIS Swath Tool. The processed results of MOD35 cloud mask are consist of 6 band ...
2
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1answer
900 views

How do I select random points within each land-cover class? [closed]

I have a MODIS file and I want to Select random points within each land cover class Extract values of rasters to the sample points. Export attribute table Could you please tell me what steps I ...
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1answer
2k views

Image collection to Single Image in Google Earth Engine

I'm stuck with an issue in google earth engine. I'm working with MODIS Burned Area Monthly Global 500m, for a certain polygon area: var MOD = ee.ImageCollection('MODIS/006/MCD64A1'); var MOD1 = MOD....
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1answer
2k views

Combine two collections (MOD13Q1 and MYD13Q1) from Google Earth Engine

Need to combine two image NDVI collections (MOD13Q1 and MYD13Q1) in Google Earth Engine but don't know how to proceed. My proposed workflow is to combine the two NDVI products from two collections to ...
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2answers
161 views

NDVI values obtained with different sensors

In a research paper with NDVI values, differences were found for the same pixel between Landsat 5, Landsat 8, MODIS or Sentinel made after the corresponding atmospheric corrections. Can this be right? ...
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2answers
107 views

MODIS product MCD43A3 stating 16 periodicity but when downloadad I have files every 8 days

I'm downloading the MODIS derived Albedo 16-Day L3 Global 500 m resolution product. I expected to have a dataset for dates every 16 days. Instead I have datasets every 8 days as can be seen in the ...
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2answers
427 views

Handling MODIS NoData cells with gdalwarp

I'm using the gdalwarp tool to convert MODIS .hdf into GeoTiff files. I want to set the value of the nodata cells so that when I import the .tif image into Grass there is no black edge. I'm using the ...
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1answer
38 views

My NDVI values are way out of range - GEE

I am supposed to collect NDVI values for some states in the USA. I understand NDVI is supposed to be between -1 and 1, but my values are in the 1000s. Can someone please help me with the ...
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2answers
1k views

Making stack from many images in Google Earth Engine?

Using the code below, I've computed 20 ndvi images for modis data. How can I stack and save them in a single file? var mod13 = ee.ImageCollection("MODIS/006/MOD13Q1") .filterBounds(geometry) ....
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2answers
1k views

Using MODIS data in ArcMap?

I have downloaded MODIS data (from ladsweb.modaps.eosdis.nasa.gov) which I would like to view in ArcMap 10.4. It's MOD14 thermal anomalies data. Currently I can place the data on a map, but it ...
1
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1answer
301 views

Timesat image output to ArcGIS

I processed MODIS MOD13Q1 NDVI times series (from 2000 to 2015) in Timesat. I specifically extracted start of season data and for each year (growth season) I was able to produce an image showing the ...
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2answers
1k views

Cannot access MODIS Download from FTP using Python

I tried to access the FTP site of MODIS data using Python ftplib module but always fail to connect. I am connecting using: ftp = ftplib.FTP("e4ftl01.cr.usgs.gov") here is the error: A connection ...
1
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1answer
163 views

stack 10 modis ndvi geotiffs and scale them by 0.0001

I have 10 geotiffs Modis ndvi named 2005.tif ... 2014.tif I want to stack them all and create timeseries. i know how to do that, but the stacked images still need scaling by 0.0001. how can i bulk ...
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3answers
379 views

Analysis MODIS NDVI - MOD12A2

I am trying to analyse the images that I downloaded from MODIS, which are the Vegetation Indices 16-Day L3 Global 1km. With this data I want to analyse the change in vegetation over the years in a ...
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1answer
233 views

Different origin between GDAL/Python and ArcMap of a Modis image

I have a Modis image and i load this image in Python using gdal library from osgeo import gdal, ogr INPUT_raster_1 = "C:\\myimage_1km.tif" ds_1 = gdal.Open(INPUT_raster_1, gdal.GA_ReadOnly) ...
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2answers
448 views

Tasselled Cap Transformation on MODIS in GRASS

I would like to know how to perform a Tasselled Cap Transformation on MODIS, in GRASS. I've found this https://searchcode.com/codesearch/view/19063909/ but I don't know if this has been tested. I'...
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1answer
3k views

How to process MODIS ndvi data using QGIS/GRASS/R?

I have MODIS ndvi data (MODIS_Grid_16 days NDVI) from the iberian peninsula (3 tiles), from February of 2000 to August of 2012 (really big data). I want to know how to deal with this kind of files. My ...
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1answer
1k views

Format MODIS HDF to Geotiff in MRT

Am using Modis Reprojection Tool (ModisTool) on MODIS LST data (MOD11A1) to convert to GeoTiff format. When I run it I get this error message: Error: OpenGeoTIFFFILE: Opening Output Image File ...
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3answers
3k views

MRT (MODIS Reprojection Tool) error: 'Input file does not exist' [closed]

EDIT: Solved, see my answer. I've downloaded 8 MOD44B granules from Reverb (using the FTP script method), and am trying to use MRT to mosaic them. I'm falling at the first hurdle though - when I add ...
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2answers
152 views

Resampling 1000m resolution Aqua MODIS images to 30m resolution

I am trying to resample the MODIS (aqua) image from 1000m resolution to LandSat image resolution which is of 30m for applying ESTARTFM technique. So you need to do preprocessing (Resampling and ...
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1answer
326 views

MODIS data for entire Earth Surface with ModisDownload in R

I am trying to use the ModisDownload function from the rts package to download, mosaic and reproject NDVI data from MODIS for the entire Earth surface. I have successfully done that for a subset ...
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1answer
943 views

Reclassifying NDWI using Google Earth Engine?

I'm trying to reclassify a NDWI raster into 1 for values >0.4 and 0 for <0.4. I understand that its possible to use .remap in case of discrete values, but not sure how to reclassify NDWI raster ...
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1answer
354 views

Automating MODIS image download and its processing in ArcGIS Desktop? [closed]

For MODIS satellite images how to automate the download, unzip, import and process to point and then to Excel for each climate satellite MODIS layer. There are 3650 days of imagery to process with 8 ...
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1answer
393 views

as I install pymodis?

unfortunately I have tried to download images bulk MODIS (NDIV and LST), but since the USGS server ((http://e4ftl01.cr.usgs.gov/) exchange ftp http, based codes R and python obsolete because I know ...
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1answer
3k views

To make HDF format files into tiff files

I have downloaded the MODIS Monthly Fire Location Product from the University of Maryland ftp Server. All the files are in HDF format. How do you make these into tiff's?
1
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1answer
609 views

Calculating maximum value in Raster Calculator of ArcGIS for Desktop?

I have MODIS NDVI data of four months and I have to calculate NDVImax. I am using the Raster Calculator of ArcGIS and have been using various algorithms like [MAX ("june2000", "july2000" , "...
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1answer
514 views

Calculating climatological albedo using MODIS satellite images?

My question is based on the paper Using NOAA AVHRR and SPOT VGT data to estimate surface parameters: application to a mesoscale meteorological model. The authors have calculated albedo, surface ...
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2answers
2k views

Using MODIS Data after FLAASH

I need to convert modis MOD021km data to reflectance and Brightness temperature. I know that some plugins for Envi is doing this with modis data but I want to run an atmospheric correction on my data ...
1
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2answers
919 views

calculate EVI for numerous tiles

I am trying to calculate EVI from MODIS data in Arc. I know how to run one raster group of 3 bands but don't know how to tell it to move on to the next group of 3 bands in that directory. Here is the ...
1
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1answer
1k views

Processing MOD35_L2 HDF Cloud Masks

I am attempting to create a binary cloud mask from the MOD35_L2 data products located at http://ladsweb.nascom.nasa.gov/data/ When opening the MOD35_L2 data in ENVI or the MRTSwath tool it reports 6 ...
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1answer
2k views

MRT (MODIS Reprojection Tool) input error

This is my first time to use Modis Swath Tool to deal with images. I've downloaded 4 MOD44B granules (using the FTP script method), and am trying to use MRT to mosaic them. When I add the 2 files I ...
1
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1answer
345 views

DOY chart in Google Earth Engine

With the following code I am trying to produce a NDVI graph with the days of the year on the x axis (based on this example, 2nd graph). var modisNDVI = ee.ImageCollection ('MODIS/MCD43A4_006_NDVI'); ...
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1answer
1k views

Google engine MODIS and filter by polygon

I tried to apply "filterBound" function to a MODIS image collection, using a polygon, but it doesn´t work. This is my script : var monte = ee.FeatureCollection("ft:1Sm4ObZgrKeCP-VlFa6Jf019-...
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1answer
156 views

Geolocation of MODIS swath products

When dealing with MODIS swath products (or any swath products from VIIRS, SeaWifs, etc) such as those available here, is there any way of a-priory knowing the location a given file covers? Typical ...
1
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1answer
177 views

Get Values of Pixels Inside Polygon (MODIS)

I am working on a problem where I have polygons for features and I want look at daily data from MODIS on, and I am looking for suggestions on how to determine which pixels it is that I need to look at....
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1answer
373 views

MODIS Reprojection Tool - setting projection parameters to UTM Zone South

The MODIS Reprojection Tool (MRT) allows users to input a UTM zone in the projection parameters, yet it defaults to North (e.g., UTM Zone 20N). Is it possible to edit the projection parameters so that ...
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1answer
125 views

modis surface reflectance

I wanted to perform atmospheric correction using MODIS surface reflectance products for validating my atmospherically corrected images (from Landsat 8). As Landsat 8 only became available in 2013, is ...
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2answers
462 views

Raster Mosaic fault using R

I'm trying to mosaic two raster images using R. I used this script: setwd("D:\\Modis EVI\\") raster_dir <- "D:\\Modis EVI\\" r1 <- brick(paste(raster_dir,"evi8_stack.tif", sep="")) r2 <- ...
1
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1answer
216 views

Doubt in MODIS NDVI range [duplicate]

MODIS-NDVI product MOD13Q1 shows range from -1986 to 9976 but NDVI ranges from -1 to 1. What these value means? What do I need to do as corrections? I have attached an image showing MODIS-NDVI ranges ...
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2answers
162 views

Modis MOD11A1 band math expression

I am trying to calculate the temperature of MOD11A1 and I can't find the expression of band math. How the expression temp < 273 could be written at band math?
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1answer
438 views

WMS for Active Fire Data from NASA site - Can't connect

I am trying to connect to the WMS service of the Active Fire Data that NASA provides. This is the site: https://firms.modaps.eosdis.nasa.gov/web-services/#firms-wms where I get the links from. My ...
1
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1answer
401 views

Reprojecting MODIS MCD64A1 to WGS 1984?

I am part of the technical team of the Autoridad de Fiscalización y Control Social de Bosques y Tierras of the Estado Plurinacional de Bolivia , and we are conducting a multi-temporal study of the ...
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2answers
1k views

Error in downloading MODIS image using R script

I am trying to download "MOD13A3" MODIS image using R script (http://r-gis.net/?q=ModisDownload) but each time it's ending in error. How to make it work ? =============================================...