Map description

The hourly maximum wind speed map of the Xizang reflects the differences of the maximum instantaneous wind speed, wind direction and wind power level in the Xizang area on that day. The map uses Temporal Data, which is presented in a dynamic way, and visually shows the wind situation in the Xizang area on that day.

Detailed description of the data

Source Data includes meteorological stations, wind speed, wind direction, wind power and other data, in Excel format, downloaded from the China Meteor ological Data Network . The rest of the data are downloaded from the 1:1 million national basic geographic database of the National GIS Resource Directory Service System .

Detailed description of data in Workspace is shown in the following table:

Datasource Name	Dataset Name	Data classification	Dataset Type	Explain
BaseMap	AdminstrationCenter_P	Administrative elements	Point	Administrative Center
	Boundary_L		Line	National boundaries
	City_L			City (state) boundary
	Xizang_R		Face	Xizang Autonomous administrative profile
	Mountain_P	Natural elements	Point	Major mountain peak and mountain passes of that Xizang.
	River_L		Line	Xizang major rivers
	Water_R		Face	The main waters of the Xizang
	Buffer	Auxiliary elements	Face	As an auxiliary face of the map ribbon
	Legend		CAD	Legend
Import	Wind 0, etc.	Preprocess the data	Point	Xizang hourly wind speed data
InterpolatorClip	WindPower 0, etc.	Interpolated data	Grid	Hourly Wind Grid of Xizang after Interpolation Clipping
TimeText	Time _ 0 _ P etc	Map name data	Point	As an aid to the dynamic display of map names
WindPower	WindPower 0 R, etc.	Isosurface data	Face	Xizang Hourly Wind Power Isosurface Data

Data Processing

1. Data Import

   Create File Datasource, set the Data Import downloaded from the China Meteorological Data Network as point data, check the "Import Spa tial Data" "checkbox, and set the coordinate field: X/Longitude as" Longitude ". Y/Latitude is Latitude.

2. Data Processing

   (1) Add date type field

   Add the date type field "TIME" of the monitoring time point

   for the imported monitoring result point data to prepare for the subsequent use of the Temporal Data tool. Refer to the Prepare Temporal Data.

   (2) Update attribute data

   Open the monitoring result point data attribute table and use Attribute Table-& gt; Edit- The Update Column tool updates each monitoring time point one by one to the attribute table of the monitoring result at the corresponding time.

   (3)Interpolation Analysis

   Since the monitoring data of meteorological stations are sample data, Spatial Analysis-& gt; is required. Raster Analysis -> Interpolation Analysis -> The Inverse Distance Weighting tool generates a grid, and the Xizang surface data is used as the Result Dataset range on the Environment page, so as to obtain the approximate value of the area without monitoring stations.

   

   (4) extracting a wind power isosurface

   ;

   Use Spatial Analysis-& gt; Raster Analysis -> Surface Analysis -> Extract All Isoregions tool, extract wind power isosurface from the grid generated by interpolation in (3), and set the isosurface distance as 1 (the isosurface distance can be flexibly set as required).

   

Drawing process

1. Make a base map

   Add administrative elements, natural elements such as water areas and mountain peaks, configure colors and symbols for them, and make name annotations as base maps.

   

2. Configure the wind iso-surface Make a Graudated Colors Map

   for the wind iso-surface and configure the ribbon. When Temporal Data is used to make Graudated Colors Map, you can first make a thematic map as a template, and use this template for other data, so as to reduce the time of drawing.

   

3. Sets the wind symbol

   The wind symbol is composed of tail feather and wind pole, which indicates the wind speed and direction. In addition to the symbol level, the symbol direction should also be considered when setting the symbol. According to the wind power level legend in this figure, the wind power is greater than level 4 (wind power & gt; 4) Set the wind power symbol at the monitoring station, and the specific steps are as follows: right click the wind speed point data, make Unique-values Map, and select "windpower" in the attribute Page SetupSingle value expression. Check the Rotation angle "checkbox and Set fields to the WIN _ D _ INST". The points with the wind power value of "0-3" are not displayed, and the rest are set with the wind power symbol of the corresponding level according to the wind power value.

   

   

4. Make a picture title

   In order to use the Temporal Data tool to realize the hourly dynamic display of map names, it is necessary to make a point Datasource to store the map names of 24 monitoring time points, and add the date field corresponding to the time for each point data.

   

5. Set Temporal Data

   Click the Map tab-> Browse- Temporal Data ", click the setting button in the upper right corner of Map, add the wind power equivalent surface, wind power symbol and Temporal Data of the map name on the Play Settings page, and the start and End Time Field are" TIME " (that is, the time point of data monitoring) by default. Set Data Time Step to "1" and Step Unit to "Time", and then set parameters such as Time Step and playback interval. Refer to the Play Temporal Data for more parameter details.

   

Graphic display