Questions tagged [modis]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
10 views

Export coordinates' values over a rectangle on Google Earth Engine

I am currently trying to export coordinates (and their values) of MODIS Aqua daily hotspot dataset for one month (November 2018). My idea is selecting a region using a rectangle geometry of the image ...
0
votes
0answers
14 views

getting maximum value of NDVI for first 10 days of month over 20 years [on hold]

I am trying to calculate the maximum NDVI of 10 first days of June from Modis images.so first for each year in have 10 NDVI image, then they will return to one NDVI image including the maximum value. ...
1
vote
2answers
33 views

stack() in R does not include all .tiff files in my directory

I am trying to perform stack() in R using enhanced vegetation index (EVI) time-series maps but it doesn't include all the .tiff files in my directory. Here's the list of files when I dir(files.evi): ...
-1
votes
0answers
28 views

How to Modify GEE script working for Landsat change detection to work for MODIS MCD12Q1? [on hold]

I have dataset from MODIS land cover product (MCD12Q1) from 2001-2016 for Thailand. Now I want to perform change detection on this pre-classifed dataset so that I can visualize the change that has ...
1
vote
1answer
14 views

Read only a specific value in LC_Type1 Class Table for MCD12Q1.006 MODIS Land Cover Type Yearly Global 500m

I have defined a specific area to look at but now I want to only read the data for the water. MCD12Q1.006 MODIS Land Cover Type Yearly Global 500m has a LC_Type1 Class Table and I only want to read ...
-1
votes
0answers
18 views

What are the bands available in MODIS aerosol product? [closed]

I just downloaded a hdf file as MODIS aerosol product (MOD04), after extracting I got 46 files. What are these files?While browsing aerosol product they refer two bands basically?
0
votes
0answers
13 views

runGdal returns “gdalinfo failed - unable to open” […] “.hdf” file

I'm trying to use the function runGdalin R on a Mac and it seems that gdalinfo is not able to open the file. In the terminal, when I entered gdalinfo /MODIS/MCD12Q1.006/2009.01.01/MCD12Q1.A2009001....
0
votes
1answer
52 views

Get maximum pixel value within numeric range

I am working with MODIS Global Primary Production (GPP) rasters and I am trying to pick the max GPP pixel value in a series of 15 dates for a study area and create a new raster layer. MODIS GPP ...
1
vote
1answer
57 views

Google Earth Engine Mask application

I'm using GEE in order to extract evapotranspiration (ET) data from MODIS (MOD16A2v6). I want to extract only ET band in order to make some further process. To do so, I apply some filters (like ...
0
votes
0answers
39 views

TIFF somewhat does not match with a shapefile

Two layers, one .shp and a NDVI image (from the MODIS, exported it in TIFF format from envi), have the same geographic coordinate system (GCS_WGS_1984), but they are not overlapping 100% in ArcGIS. ...
1
vote
1answer
20 views

Is the layer value of MODIS Day_view_time and Night_view_time in Local Time or in Local Solar Time?

On the NASA homepage in the layer description you can find following line for the Day_view_time layer: Does this mean that the layer contains the Local Time (LT) in the corresponding local time zone ...
0
votes
1answer
51 views

Why is this MODIS Output from Google Earth Engine Shifted?

I'm creating and saving the NDVI output of MOD13Q1 of a given district to Google Drive from Google Earth Engine. If I use the following code, the output tiff gets generated, but it is shifted about ...
2
votes
0answers
33 views

Smoothing MODIS LAI? [closed]

I am trying to smooth 8 days LAI data from MODIS and managed to work around it with several algorithms such as loess, Savitzky–Golay, smooth.spline etc. This is pretty much going well if the level of ...
0
votes
1answer
49 views

MODIS HDF file without Coordinate System?

I am using the MOD04_L2 MODIS Aerosol Deep Blue product from the LAADS API. These files are in hdf4 format, but I am transforming them to hdf5. I did transform the files because I'm unable to compile ...
0
votes
1answer
57 views

Using BFAST Spatial algorithm in R?

I have 65 monthly MOD11A2 (LST) images. The images came from the average of the original 8 day products. I have made them a time series stack using the timeStackMODIS function of the bfastSpatial ...
0
votes
1answer
30 views

Make a loop in Google Earth Engine for reduce NDVI from year a months?

I have this code, it generate N ImageCollection and for each image a chart from NDVI in function a the months This is the place of study: var areaEst = ee.FeatureCollection("users/aleszczuk/...
1
vote
1answer
77 views

Creating loop in Google Earth Engine?

I have written a code that is taking data from MODIS about NDVI, filter for March only , calculates the mean value for the whole month and clip it with geometry. The NDVI data is for period of years, ...
1
vote
1answer
26 views

Range value of raster data varies before and after mosaic implementation

I am trying to raster::mosaic bunch of .tif files extracted from hdf4 MODIS files. My script is working fine but I am puzzled by the range of raster values (min, max) before and after data processing. ...
0
votes
1answer
24 views

How to modify MODIS subset function to download product for a specific region and time period?

I am trying to assess the land cover change that has occurred over East Asia over last 18 years only in winters (Oct-Jan) for which I want to use MOD13Q1 dataset of modis from 2000-2018. I am using ...
0
votes
1answer
44 views

Getting 16 days composite in Google Earth Engine? [closed]

I've wrote this code. In this code I've call lst daily product. But I don't know how can I compute 16 days mean composite from daily product? code link: https://code.earthengine.google.com/...
0
votes
0answers
18 views

How to use the reducer.mean function to average multiple data points?

I am trying to figure out GDD over a period of multiple years given a period of time for each year, and the code provided below allows me to do that. Now that I have 10 years of data points, I am ...
1
vote
0answers
15 views

Geo-Referencing level 1 AQUA data

I have a direct broadcast AQUA data. I used RT-STPS to extract the level 0 .PDS files and process them further to level 1A and level 1B using the modisL1DB software. These produce .hdf files. I can ...
0
votes
1answer
48 views

Summing multiple image outputs in earth engine?

I am doing some GDD data analysis for a project and am having trouble coming up with a way to effectively analyze a specific time of the season over multiple years. What I am trying to do is find ...
0
votes
0answers
35 views

GEE: Different monthly result of ET with same dataset

The following code produces a graph with monthly ET from 2001-2015 over a region. https://code.earthengine.google.com/e832ebf5c6682669456a050d7c532e58 In contrast, when plotting the daily data, ...
0
votes
0answers
16 views

MODIS values too high after HDF4 to TIFF conversion

after converting MODIS NDVI and EVI (in HDF4 format) to tifs the values seem way too high (e.g. 2e+07), even after the multiplication with the scale factor (0.0001). As I can't access the data before ...
1
vote
0answers
32 views

Calculating MODIS 8-day composite GPP product as yearly [closed]

I want to use MODIS GPP 8-day composite product for an annual time series analysis. How to calculate the annual GPP from the 8-day composite? Since the fractions represent the daily average rates of ...
1
vote
0answers
65 views

R MODIS MOD13Q1 - How to handle data quality issues?

I'm running into some issues with 250m 16-day MOD13Q1 NDVI data using the MODIS package in R. Looking at the following raster plot, there are certain days where the NDVI does not match the true ...
0
votes
0answers
27 views

Using a MODIS code for DAYMET and I don't get any output

I am using the code below that was originally provided by @Kuik, and I have since converted the bands to DAYMET 'tmax' and 'tmin' bands. Problem is that when I run the code, I receive no output. ...
1
vote
1answer
44 views

Why is the difference between 005 and 006 versions of MOD13Q1 data?

I tried to repeat a project that used EVI in MOD13Q1. I failed and found that the project used the 005 version of MOD13Q1, and I can only download the 006 version on NASA's ftp. I compared the 005 ...
1
vote
1answer
36 views

Using accumulate function for temperature units?

I am working on a piece of code that is designed to aggregate growing degree days for a particular region. To start, the equation for growing degree days is: Daily GDD (°F) = Daily Average ...
2
votes
1answer
178 views

How big is a MODIS 250m pixel in reality?

How big is a MODIS 250m pixel in reality? This appears to be a question that contains its own answer, but I have several reasons to doubt that the pixel size is actually 250m x 250m: I downloaded ...
2
votes
0answers
50 views

Downloading subset of MODIS data through HTTPS [closed]

I need to download 'MYD04_3K - MODIS/Aqua Aerosol 5-Min L2 Swath 3km' data for India. I found two ways to download it: Go to the website and select product details etc. I have been able to automate ...
0
votes
1answer
20 views

Create KML by date

I have the following table that is populated with new data once a day. postgres=# \d modis_c6 Table "public.modis_c6" Column | Type | Collation | Nullable | Default --...
0
votes
0answers
88 views

Growing Season Length in Google Earth Engine?

I am trying to estimate growing season length with the MCD12Q2 dataset (Land Cover Dynamics Yearly L3 Global 500 m), which includes dates for the start and end of the growing season (...
2
votes
2answers
113 views

Calculating number of days between first and last frost in Google Earth Engine?

I want to do two things. First, I want to map the number of nights that have temperatures below 0 in one year. This code seems to do this. Second, I want to calculate the number of days between ...
1
vote
1answer
39 views

How to create heat map animation based on point-shapefile with data attribute in ArcGIS?

I want to create an animation of forest fires, using the NASA' MODIS data for the last 11 years. Their shapefile has acquisition data attribute — and it goes day by day all those years. I've already ...
1
vote
1answer
63 views

How does ee.Reducer.median() differ from just ee.ImageCollection.median() - Issues with a chart?

I am trying to create a chart that displays an image series from an Image Collection and there are two things that I do not understand: In the first part of the code that you will see below, I do not ...
0
votes
1answer
43 views

Why is {maxPixels : } set to 1024 for MODIS and 80 for Landsat?

I am currently trying to understand how images are resampled and reprojected in google earth engine and I came across this tutorial: https://developers.google.com/earth-engine/resample Why is ...
2
votes
1answer
103 views

NDVI index based on QA bands for MCD43A4 , in GEE

I want to calculate the NDVI index based on the MODIS/006/MCD43A4 collection and based on quality bands, but as a new GEE user I have no idea If I am on the rght way to do this. So far I have the ...
3
votes
1answer
49 views

More information about GEE dataset needed

I have a rather basic question, in relation to the MCD43A4 006 NDVI dataset in GEE. I am aware of the methods used for the generation of the BRDF MODIS dataset, but I would like to know more details ...
3
votes
1answer
109 views

Reclassification of MODIS collection in Google Earth Engine

I want to reclassify the MCD43A4_006_NDVI collection and change all negative values into NAs. I have the following code but I am not sure how to do this. Any ideas? var geometry = /* color: #...
0
votes
1answer
113 views

Google Earth Engine, Image Collection Statistics?

I've wrot below code for time series processing via modis LST product, but it shows this error: ImageCollection (Error) Error in map(ID=2018_06_02): Image.constant: Parameter 'value' is required. ...
0
votes
0answers
19 views

How to access MODIS map service from livefeeds.arcgis.com?

How can I access MODIS map service from configurable map viewer ? Here is my code from viewer.js : var token = 'OvKOMsp8IMRZE5E0FbtsmLx-nUMulBrbukj_1w-i_F-Taxpx5wwC3C7ZcufAsOiA-gV-c3-...
1
vote
1answer
74 views

Trouble Getting MODIS Fire Data with Google Earth Engine

I am trying to use the MODIS Terra Thermal Anomalies & Fire Daily Global dataset to get fire data in a date range at random points. I have the following code: var dataset = ee.ImageCollection('...
0
votes
0answers
20 views

Higest-resolution daily temperature products?

I'm looking to collect daily temperatures for a very small geographic area, and as such am in need of some high-resolution products. I have used MODIS, but the data comes with a 1km resolution. Are ...
1
vote
1answer
51 views

Point data extraction and printing as a TABLE

I am working with MODIS-NDVI image collection in Google Earth Engine. Below, you can find a script which is creating a chart of NDVI values over the given period for particular location. I would like ...
1
vote
2answers
84 views

How to classify entire pixels within loaded polygons as a feature collection, in Google Earth Engine

I need to determine the Modis pixels that enter whole within the polygons contained within a feature collection. I also need to determine those who don't fully enter. Apologies for English This ...
0
votes
1answer
113 views

Select observations based on Quality Bands , Google Earth Engine

From the following NDVI collection, I want to keep only the observations with Good Quality (equal to zero). I try to do this with the SummaryQA but I get "Pattern 'SummaryQA' did not match any bands"...
0
votes
1answer
121 views

Unable to transform features into projection, Google Earth Engine

I have the following code with which I try to export the MODIS NDVI index. I have rescaled the collection with the appropriate scale factor and code runs without errors. When I try though to download ...
0
votes
0answers
34 views

How to define 3 average month values in a NDVI Modis time serie

I am working with MODIS NDVI rasters from 2016. I have 365 rasters (one per day). I need to have 3 rasters per month (total = 36). First raster = average of the first 10 days. Second raster = average ...