data cube live demo · 2021. 4. 21. · live demo. this document contains proprietary and...
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1This document contains proprietary and controlled information of National Space Organization (NSPO) of Taiwan and shall not be duplicated in whole or in part for any purposes without permission from NSPO.
2021/03/26
Hsuan-Cheng Wei
TWDC workshop @TSW
Data Cube Live Demo
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2This document contains proprietary and controlled information of National Space Organization (NSPO) of Taiwan and shall not be duplicated in whole or in part for any purposes without permission from NSPO.
Outline
• DC with Jupyter
How to implement data with Jupyter
Case demonstration
• Custom mosaic
• Paddy field survey
• Fusarium wilt of banana in Taiwan
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3This document contains proprietary and controlled information of National Space Organization (NSPO) of Taiwan and shall not be duplicated in whole or in part for any purposes without permission from NSPO.
Data Cube Data Implementation
Data ImportHow does DC data work in Jupyter notebook?
The key is called ‘xarray’.
Xarray introduces labels in the form of dimensions,
coordinates and attributes on top of raw NumPy-like
arrays, which allows for a more intuitive, more
concise, and less error-prone developer experience.
The package includes a large and growing library of
domain-agnostic functions for advanced analytics
and visualization with these data structures.
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Data Import
Export Data
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Custom mosaic
Create median mosaic image
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+ =
2018/11/21 2018/12/17 2018/11/21+2018/12/17
Single Day Searching Result
Single Day Searching Result
Period Searching Result
Customized Mosaic
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Create median mosaic image
Small block division
Create median mosaic
image
Merge image
Create area mask
image
Median Mosaic
Creates cloud-filtered mosaics using the "middle" spectral response of
each band in a time series. Since the bands can vary independently, the
result is often a "synthetic" product that is not representative of any
particular time. This type of mosaic is also possible with radar data.
Create area mask imageCreate median mosaic
Merge image
Thailand area
median mosaic image
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Custom mosaic usingdata cube in Thailand: Demo
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Show results with QGIS
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Paddy field survey
Land cover change: CVA
Spectral index operation: NDVI and NDWI
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Paddy rice detection usingdata cube in Thailand: Preliminary study
Buriram
Study Area: Near by
region around Buriram
Multi-Temporal Remote Sensing Data of 2019
25KM
24
KM
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NDVI (Normalized Difference Vegetation Index) of different periods
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NDWI (Normalized Difference Water Index) of different periods
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Results of Detected Paddy Rice
Paddy rice
SENTINEL-2
(2019/10/21)
Maximum Biomass
SENTINEL-2
(2019/11/20)
Harvested
Estimated paddy rice area: 14477.7(HA)
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Paddy rice detection usingdata cube in Thailand: Demo
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Fusarium wilt of banana in Taiwan
Spectral indices analysis in Data Cube to
detect anomaly of banana trees
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Fusarium wilt of banana
In October, 2019, Fusarium wilt of bananas was
found in Chonglan Farm in Taiwan .
Typical symptoms are chlorosis of leaves and
vascular discoloration.
Infected banana trees were removed and the
soil was processed to prevent further infection.
South Taiwan, Ping Tung
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Banana monitoring using satellite images
Data Cube
Data acquisition and ingestion
Multi-temporal spectral indices analysis
Time series
data of natural
color
composition
images
• Temporal spectral index analysis for
disease area
• Disease feature detection for early
warning
Time series
data of NDVI
images
Time series
data of NDWI
images
Time series
data of false
color
composition
images
Analysis Workflow
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Spectral index analysis
Periods : 2019 / 06 to 2020 / 05
NDWI (Normalized Difference Water Index) of
different periods
NDVI (Normalized Difference Vegetation Index) of different periods
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Disease location Healthy location
2019/11/27
Mid-plant stageHarvest
heading period
2020/02/20
2019/11/27 2020/02/20
Seedling stage
Spectral indices NDVI analysis to detect
anomaly of banana trees
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2019/11/27
2020/02/20
2019/11/27 2020/02/20
Mid-plant stageHarvest
heading period
Seedling stage
Disease location Healthy location
Spectral indices NDWI analysis to detect
anomaly of banana trees
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Fusarium wilt of banana in Taiwanusing data cube : Demo