Google Earth Engine(GEE)——估计未来人口密度(越南2100年人口预测)

该博客通过Google Earth Engine(GEE)利用1980年越南人口数据,进行线性回归分析,预测了2100年越南的人口密度。文章提供了可调整的研究区域分析代码。

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依据1980年的越南人口,预测2100年的人口来预测

 

 

 

代码:

var geometry = 
    /* color: #d63000 */
    /* displayProperties: [
      {
        "type": "rectangle"
      }
    ] */
    ee.Geometry.Polygon(
        [[[105.35068452358246, 21.401818574343782],
          [105.35068452358246, 2
### Google Earth Engine MODIS 8-Day Terra and Aqua Cloud Cover Composite Product Documentation and Usage In the context of satellite data processing within platforms like Google Earth Engine (GEE), specific products cater to various environmental monitoring needs. For snow coverage, an enhanced MODIS 8-day Terra and Aqua integrated product exists specifically tailored for High Mountain Asia (HMA)[^1]. However, regarding cloud cover, while not directly addressed in the provided references about snow or vegetation indices[^3][^4], one can infer that similar methodologies apply due to the nature of how these datasets are processed. #### Understanding the Data Source The input data for such a composite would likely come from both MODIS Terra (MOD) and MODIS Aqua (MYD). These satellites have distinct overpass times which influence their ability to capture different conditions throughout the day. Specifically, Terra passes at approximately 10:30 AM/PM local time whereas Aqua does so around 1:30 PM/AM[^2]. For cloud cover analysis using GEE's MODIS suite: - **Data Collection**: Utilizes daily observations made by both sensors. - **Temporal Resolution**: An 8-day synthesis period aligns with other MODIS products designed for reducing noise through temporal aggregation. - **Spatial Resolution**: Likely maintains consistency with related MODIS products offering resolutions suitable for regional studies. #### Accessing and Using the Dataset To work with this type of dataset in GEE involves several key steps typically including loading the collection into your script environment, filtering based on date range or geographic area, applying any necessary corrections or transformations, and finally visualizing or exporting results. Here’s a basic example demonstrating how you might load and visualize an 8-day cloud mask layer derived potentially from either sensor but adapted here conceptually for illustration purposes only since exact implementation details depend heavily upon actual available layers matching described specifications: ```javascript // Load MODIS/Terra+Aqua Cloud Cover 8 Day Composite ImageCollection var modisCloudCover = ee.ImageCollection('MODIS/006/MOD09GA') // Placeholder path; adjust according to real dataset ID .filterDate('YYYY-MM-DD', 'YYYY-MM-DD'); // Specify start and end dates Map.setCenter(longitude, latitude); // Set map view center coordinates Map.addLayer(modisCloudCover.select(['state_1km']), {min: 0, max: 1}, 'Cloud Mask'); ``` This code snippet assumes existence of a compatible image collection named similarly to existing MODIS collections found within GEE catalogues. Adjustments will be required depending on precise naming conventions used for hypothetical cloud cover composites. --related questions-- 1. What preprocessing techniques improve accuracy when analyzing multi-temporal cloud masks? 2. How do varying spatial resolutions impact interpretation of cloud patterns across diverse landscapes? 3. Can machine learning algorithms enhance detection rates compared to traditional threshold-based methods? 4. Are there seasonal variations influencing effectiveness between morning versus afternoon satellite acquisitions?
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