Download Rainfall Data 1901-2021 and Prepare Annual Rainfall Map
Summary
TLDRThis tutorial video guides viewers through downloading high-resolution monthly netCDF rainfall data, processing it for a specific time period, and creating an annual rainfall map. It covers extracting and compositing data bands, converting raster to point data, performing interpolation, and designing a map layout. The video is aimed at remote sensing enthusiasts and environmental solution seekers, providing a step-by-step guide to analyze rainfall data effectively.
Takeaways
- 🌍 The video provides a tutorial on downloading high-resolution netCDF monthly rainfall data for a specific region.
- 📅 It covers the process for the period from 1901 to 2020, with the data version released on 17th March 2021.
- 💾 The tutorial includes instructions on how to process daily netCDF files and separate composite bands.
- 📊 It demonstrates how to calculate annual rainfall and convert raster to point data.
- 🗺️ The video guides viewers on how to perform interpolation to create an annual rainfall map layout according to the area of interest.
- 🖥️ It involves using ArcMap and its toolbox to create a netCDF raster layer from the downloaded data.
- 🔄 The process includes exporting data, renaming layers, and adjusting the data frame to match the projected coordinate system.
- 🔢 The tutorial shows how to composite bands from a 10-year data set to create a single annual rainfall map.
- 📏 It explains the use of cell statistics to aggregate monthly data into an annual total.
- 📊 The video covers the conversion of raster data to point data for further analysis.
- 🔄 The tutorial includes using interpolation methods such as Inverse Distance Weighting (IDW) for creating a more detailed rainfall map.
- 🎨 Finally, it guides on creating a map layout with appropriate symbols, legends, and other map elements for the final annual rainfall map of 2020.
Q & A
What is the main topic of the video?
-The main topic of the video is demonstrating the process of downloading high-resolution netCDF monthly rainfall data, processing it, and creating an annual rainfall map layout according to the area of interest.
Which dataset does the video guide viewers to download?
-The video guides viewers to download the 'high resolution gradient dataset' which covers the period from 1901 to 2020.
What software is used to process the netCDF files in the video?
-ArcMap is the software used to process the netCDF files as demonstrated in the video.
How does the video instruct to extract and process the precipitation data?
-The video instructs to extract and process the precipitation data by using the 'Make NetCDF Raster Layer' tool in ArcMap, selecting the precipitation variable, and setting the x and y dimensions.
What coordinate system does the video suggest changing to?
-The video suggests changing the coordinate system to UTM, Northern Hemisphere, Zone 46N.
How does the video demonstrate the creation of a composite band for annual rainfall?
-The video demonstrates the creation of a composite band for annual rainfall by selecting the last 12 bands from the dataset and using the 'Composite Bands' tool in ArcMap.
What tool is used to convert raster data to point data in the video?
-The 'Raster to Point' tool is used to convert raster data to point data in the video.
What interpolation method is used in the video to create the annual rainfall map?
-The video uses the Inverse Distance Weighting (IDW) method for interpolation to create the annual rainfall map.
How does the video guide creating a map layout for the annual rainfall map?
-The video guides creating a map layout by inserting a title, changing symbol sizes, adding a legend, adjusting symbology, and customizing the north arrow and scale bar.
What are the steps to save the final annual rainfall map according to the video?
-The steps to save the final annual rainfall map include editing properties, changing font sizes, level offsets, and intervals, and exporting the map in various formats with a selected resolution.
Outlines
🌍 Introduction to Downloading and Processing Rainfall Data
This paragraph introduces the video's focus on demonstrating how to download high-resolution netCDF monthly rainfall data and process it. The speaker guides viewers through accessing the CRU data, selecting the high-resolution gradient dataset, and downloading precipitation data for the year 2020. The process involves navigating through an interface, selecting data variables, and extracting the dataset. The viewer is then instructed to open ArcMap, use multi-dimensional tools to create a netCDF raster layer, and set parameters for dimensions and output. The tutorial also covers renaming and saving the data layer, adjusting the coordinate system, and saving the projected file.
📈 Preparing and Analyzing Annual Rainfall Data
The second paragraph delves into the preparation of an annual rainfall map for the year 2020 using a decade of data from 2011 to 2020. The speaker explains how to select specific bands from the dataset, use data management tools to restart and composite bands, and perform cell statistics to convert monthly data to annual. The process includes exporting data, renaming layers, and using conversion tools to transform raster data into point data. The paragraph concludes with instructions on performing interpolation using the Inverse Distance Weighting (IDW) method, setting output cell size, and defining the processing extent according to the study area.
🗺️ Creating an Annual Rainfall Map Layout
The final paragraph of the script details the steps to create a map layout for the annual rainfall data. It includes instructions on adding a title, adjusting symbol sizes, inserting a legend, and formatting labels. The speaker also covers how to customize the legend's appearance, including font size and item levels. Additionally, the paragraph explains how to add and edit a north arrow and scale bar, and how to adjust their properties for appearance and readability. The tutorial concludes with exporting the map in various formats and resolutions, with a focus on selecting an appropriate map resolution for the final output.
Mindmap
Keywords
💡Remote Sensing
💡Environmental Solutions
💡High-Resolution Data
💡NetCDF
💡Raster Data
💡Annual Rainfall
💡Interpolation
💡IDW (Inverse Distance Weighting)
💡Map Layout
💡Coordinate Systems
💡ArcMap
Highlights
Introduction to downloading high-resolution netCDF monthly rainfall data for the whole globe.
Tutorial on processing daily netCDF files and separating composite bands.
Explanation on calculating annual rainfall and converting raster to point data.
Demonstration of performing interpolation to create an annual rainfall map layout.
Accessing CRU data and selecting the high-resolution gradient dataset.
Downloading precipitation data for the year 2020.
Extraction and opening of the downloaded dataset in ArcMap.
Creating a netCDF raster layer from the downloaded data.
Exporting data and renaming the output file to 'layer 2012 to 2020'.
Changing the data frame to the projected coordinate system UTM.
Preparation of the annual rainfall map for the year 2020 using a 10-year data set.
Composite bands selection and output raster creation for annual data.
Conversion of raster data to point data for further analysis.
Interpolation using IDW method for creating an interpolated rainfall map.
Creating a map layout with a title, legend, and symbology for the annual rainfall map.
Customization of the map layout including font size, legend items, and north arrow.
Exporting the final annual rainfall map in various formats with adjustable resolution.
Transcripts
hi everyone
welcome again to jazz remote sensing and
environmental solution channel
in this video i will show you how to
download high resolution net cdf monthly
rainfall data for the whole old
how to process daily net cdf file
separate and composite band how to
calculate annual rainfall convert raster
to point data and finally how to perform
interpolation and make annual rainfall
map layout according to the area of
interest hope you will enjoy and it will
be useful for you
right write cru data
and then click high resolution gradient
data set
after that you will get this interface
here uh this version released 17 mars
2021
and covers the period 1901 to 2020
here uh
there is a local copy click on this
and then uh main grid data click on this
data variables here you will
find a different data
set
cloud
precipitation and
so on click on precipitation as we need
uh precipitation data
so uh from here
click uh
2020 data set
our data has downloaded
now uh i'm extracting the data
here is the data set that i have
downloaded
open arcmap
and then go to toolbox and
then
multi-dimension tools and then
make net cdf
raster layer
from uh input
data
input the raster file that
you have downloaded
variable precipitation
x dimension y dimension output layer
band dimension
select time
and then click ok
uh i'm adding a study data share file
export data
then extend according to data frame
save
the output file
i am going to rename it
to
layer 2012
to 2020
then click save
yes
the previous one on it
gem to layer
properties
source
you can see here
the special reference
wgs924
so i'm going to
change the data frame
according to
the projected coordinate system utm
northern hemisphere
46 not utm
and then again go to
data and then special difference
according to data frame
special reference has been changed
i'm going to rename it at projected file
then click save
i'm going to delete the previous file
uh i want to prepare enrolled rainfall
map for 2020.
uh here we have a 10 years data that
starts from 2011 to 2020 so
10 uh into 12 uh equal uh on 20 bands
total
so i have to select last
12 bands from uh 1
0 9
1 0 9 to
120
trading 12 bands
then go to data management tools and
then restart
then raster processing
and composite bands
click on composite bands
add all of them here
and uh
output raster save your output roster in
a
folder of your pc
you can give it a name
and then click okay
i don't need this
this band so i'm getting
and then go to special analyze tools and
then local
then cell statistics
input raster or
and then
write
a name
for output resistor and all rainfall
2020
overall statistics
then here some
i mean monthly to annual
then click ok
it has done
and now conversion tools
from raster raster to point
input raster
add input roster
and then output raster
[Music]
select the folder
and give it a name
enable
annual rainfall
20
then click ok
point has been created
here is our study area
make it hollow
and
then go to special earnest tools and
then interpolation
you can do it uh using idw or clinging
so i'm using idw
input raster
add input raster
you can see here grid code
that value
so
select grid code as z value field
then output resistor
select
the folder where you want to save your
file
and
rename it
or give it a name
i'm going to give it a name enrolled in
for 20.
output
cell size
i am giving a 90 as output cell size
then environments
processing extent
it will be according to my study area
strategy
boundary and then raster analysis cell
size
90
and max data will be according to study
area
then click ok
the idw has been done i mean
interpretation has been done
according to the data
now uh
create map layout i think it is very
easy for you
first
give a title
from insert title annual rainfall 2020
then go to properties and then change
symbol
you can increase or decrease the symbol
size
then ok ok
and then insert
a legend
and on rainfall
then next
click on properties
then symbology
classes
i'm selecting 6 classes then format
labels
three
okay
you can change the color
annual rainfall
20
then go to properties general
for legend you can
increase the size doesn't
font size
and then items
level
i have selected 16.
you can edit as per your preference
and then
north arrow
you can select
scale bar
you can edit from properties
division in it kilometer
or miles
for from format you can increase the
size
great
levels only appearance then next
next
properties
click ok
now i can edit from properties again
from labels
you can change the font size
level offset
level orientation
then also intervals
and so many items you will find from
here
you can save the map as uh export map
in several formats
jpg png and so many uh
format resolution you can increase or
decrypt the regular resolution for final
output
i have selected
600 for map resolution
and then save
so here is our final output annual
rainfall 2020.
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