6
votes
Accepted
Reducing image collection to get daily sum from hourly precipitation and extraction of polygon data?
This post explains how to do that for months. Here it is adapted for days:
var gsmap = ee.ImageCollection('JAXA/GPM_L3/GSMaP/v6/operational')
.select(['hourlyPrecipRate'])
.filterDate('2015-...
- 4,309
4
votes
Locate wet patches using DEM
The subject has a lot of atention among specialists and the number of tools available depends on the amount of work you wnat to put on it. The paradox is that you want to avoid wet areas while ...
- 3,180
4
votes
Accepted
Storm Total Precip Map
Your NoData cells actually contain the value -10'000 and therefore produce said "strange values". So you need to tell the Raster Calculator to ignore these values. You can do this using SetNull (see ...
- 1,467
4
votes
Google Earth Engine: precipitation data, summing monthly data is not matching annual sum
As your code has several issues, I fixed them for adequately running it. On the other hand, as your HUC6_RMP bound is unknown for me, I assumed an arbitrary point in Idaho for only two years (1994, ...
- 29.4k
4
votes
Accepted
Download GLDAS precipitation monthly 1 km resolution data by Earth-engine
For GLDAS precipitation monthly you could use 'Rainf_f_tavg' or 'Rainf_tavg' bands from 3 hourly "NASA/GLDAS/V20/NOAH/G025/T3H" product (resolution of 0.25 arc degrees). It would produce 8 daily ...
- 29.4k
3
votes
Accepted
GEE Converting Units of the FLDAS Precipitation data (Rainf_f_tavg) from kg m-2 s-1 to mm/month
You are trying to apply the .expression to the entire ImageCollection. Unfortunately .expression can only be applied to an ee.Image() object so you have to map your function over the entire image ...
- 2,043
2
votes
Any standards for urban rainwater drainage network?
I work with our city's storm sewer team and they are required to keep all of their data in NASSCO formats and standards. In addition to the attributes like material, length, etc, NASSCO standards ...
- 3,862
2
votes
Accepted
Daily temperature data portal globally
The Open Data Stack Exchange has an excellent community wiki question with links to many different sources of weather data: Sources of weather data
- 24.3k
2
votes
Solving computing time problem when grid size element increases in flood model?
Depending on your problem and the nature of the details you want to keep, you might want to :
Use a channel with cross sections in Flo-2D to have a close approach of the river bed
Use coarser ...
- 1,917
2
votes
Accepted
Batch raster operations to get Maximum Precipitation in Catchment
Here is a translation of the steps in your question to GRASS commands. Without knowing how your data are structured, I'll make some assumptions. Lets say the precipitation data are CSV files with ...
- 15.4k
2
votes
Accepted
QGIS: Creating average of a precipitation multiple raster set?
If you want to take an average of all 12 images, the process is very simple. Within a raster calculator (this can be the calculator in the raster drop-down menu or the GDAL/GRASS/SAGA calculators in ...
- 1,388
2
votes
Accepted
WGS84 projection is invalid for aggregations
In this section
var precipNum = lastPrecip.reduceRegion(ee.Reducer.last(), geom)
...
The issue is that lastPrecip is a temporary layer only stored in memory and doesn't have a nominal scale so GEE ...
- 1,603
2
votes
Locate wet patches using DEM
To fully answer your question I need more information on what exactly you define as "wet patches", but I believe that you are looking for the tool "Flow Accumulation", explained here by ESRI.
You ...
- 229
2
votes
Standardized Precipitation Index (SPI) equation using ArcGIS Desktop
Here you can find ArcGIS toolbox for calculating SPI.
This toolbox was made with the same algorithm in the spreadsheet.
https://github.com/Hyun-Woo-Jo/CalculateSPI/releases/tag/v1.0
- 21
2
votes
Locate wet patches using DEM
Calculating the topographic wetness index should be of great use. Its a classic metric for determining likely wet and dry patches relative to the rest of the landscape based on the curvature and ...
- 979
2
votes
Interpreting GLDAS 2.1 precipitation data
The metadata says the following:
"The GPCP 1-degree Daily (1DD) dataset is used and disaggregated to 3-hourly interval"
From that, and since the timestamps in the filenames run from *0000* to *...
- 1,216
2
votes
Bilinear resampling yields inaccurate/small values (Earth Engine)
This question is over 2 years old, but I was having the same issue and worked out what was going wrong, so here is my answer.
The problem is in how Google Earth Engine handles projections. The help ...
- 70
2
votes
How to find out which areas are affected by flooding due to heavy rain?
I am unsure how accurate you want your results to be, my understanding is that you can do one of two approaches:
Find known water level points for the rainfall event and create an interpolated ...
- 832
2
votes
Accepted
Selecting only CFSR images in Google Earth Engine with precipitation data
The hour is saved in the property forecast_hour of every Image. You can use this property and .filterMetadata() to filter only those with forecast_hour: 3. Here's the code:
var dataset = ee....
- 3,679
2
votes
Accepted
Iterating over dates to extract precipitation in Google Earth Engine
You do this by mapping over the feature collection. Unfortunately I think you didn't give access to your script to others, so I can't test it. But this should work:
// CSV file
var coord = ee....
- 3,679
2
votes
Accepted
Contours into polygons with QGIS
Try extending the lines past the boundary of the polygon, like so:
- 14.1k
1
vote
Accepted
Rainfall interpolation using ArcMap
Use the Resample tool and specify bilinear or cubic as the resampling type.
- 63.7k
1
vote
Standardized Precipitation Index (SPI) equation using ArcGIS Desktop
There was a discussion at GeoNet titled How to calculate Standard Precipitation Index (SPI) using ArcGIS which suggests that there is a way to "calculate the SPI using monthly CHIRPS CHG - Data" using ...
- 64.8k
1
vote
Clustering Raster Monthly Precipitation Pattern
After I posted my other answer, I realized there's a much faster way to do it.
Use the Raster Pixels to points tool on one of your rasters. This creates a point layer with one point per pixel.
Use ...
- 24.3k
1
vote
TRMM 3B42RT product has no Coordinate Reference System?
Let's look first at the information provided by gadlinfo for the 3B42RT.2016010100.7.7day.tif file:
C:\>gdalinfo 3B42RT.2016010100.7.7day.tif
Driver: GTiff/GeoTIFF
Files: 3B42RT.2016010100.7....
- 13.4k
1
vote
Average precipitation raster
You need to use a tool such as The netCDF Operators, or NCO. Have a look to the user guide http://nco.sourceforge.net/nco.html.
I have no idea how your data is organized, but have a look to this ...
- 3,180
1
vote
Accepted
Interpreting GLDAS 2.1 precipitation data
The answer to your question is that neither 1-3 of your proposed answers is correct, exactly. From the manual, we read:
"file name for 3-hourly 0.25 degree GLDAS-2.1
Noah data at 03:00Z on 1 January ...
- 2,874
1
vote
Moisture Stress Index - how important is seasonal influence in a deciduous forest?
The seasons have a significant impact on the biochemistry and biomechanics of deciduous tree species. What you are experiencing is not necessarily surprising because when a deciduous species undergoes ...
- 3,160
1
vote
Summation of multiple map layers?
To do this by year, you can reduce the timeframe of each individual year using ee.Reducer.sum() and then add the two years together:
var dataset = ee.ImageCollection('IDAHO_EPSCOR/GRIDMET');
var ...
- 1,896
1
vote
Accepted
Reducing hourly rainfall data to monthly data for particular period of time and making a timeseries chart
I tried it couple of times and indeed the computation timed out easily. Possibly this is due to the fact that the images you are using are global. A way to fix it is clip the images to a certain ...
- 9,903
Only top scored, non community-wiki answers of a minimum length are eligible