Ncl map projection. The data are on a Lambert Conformal projection.

Ncl map projection By doing this, you can then change the map projection, zoom in on it, and/or overlay primitives, as we did here with a red box. NCL Home> Application examples || Data files for some examples. The special examples are developed at DKRZ to support our users and to demonstrate NCL’s capabilities (here NCL version 6. NCL WRFUserARW. Additionally, the tfDoNDCOverlay resource is set to True to tell NCL we are plotting the data natively. Prototype May 13, 2024 · 读取文件. ncl: The simplest. ncl: This example plots the same data as the previous "lcnative_1. See the next example which compares the two different resolutions using a panel plot. ncl支持的文件; 评论; 了解ncl语言. 0, the NCL map databases were updated to reflect the current Colorado counties. In NCL version 6. 根据官网例子Using gsn_csm_contour_map to plot WRF-ARW data绘制：; It shows how to use gsn_csm_xxxx scripts to do the plotting. 4. To use, copy the "add_map_tickmarks" function to your own code, and then set the locations where you want tickmarks by setting one or more of these resources: The map projection information is provided on the file as attributes of the "gridlat_0" and "gridlon_0" variables on the file. Subsetting a color map. To mask the projection, you must set the boundaries with the following resources: mpMinLonF mpMaxLonF mpMinLatF mpMaxLatF mptick_9. ncl" script on the New color capabilities page. 0 and earlier, the NCL outlines will not show the county of Broomfield or the updated counties around Denver. Drawing filled contours over a Lambert Conformal map. ncl: Demonstrates how to explicitly label the axes with the tickmarks and labels you want. This information is used to set the necessary map resources for plotting the data natively. proj_1. There are other projections to choose from. Creates a map background for ARW WRF model data. For information about drawing high-resolution coastlines, see this information on the RANGS/GSHHS database. 0, This resource specifies the distance in multiples of the earth's radius of the satellite at the view origin. res@mpPerimOn = False ; turn off map perimeter res@mpFillDrawOrder = "PostDraw" ; draw map fill last res@gsnRightString = "" ; turn off special titles res@gsnLeftString = "" res@tiMainFontHeightF = 0. py# This script illustrates the following concepts: Drawing contours over a map using a native lat,lon grid. This function creates and draws a contour plot over a polar stereographic map projection on the given workstation. ;; You can use the map projection settings on the WRF file, or you ; can use your own map projection. The right image is from running NCL V6. This sets the necessary NCL resources to define the native map projection. There's a third function called gsn_csm_map_ce, but it simply calls gsn_csm_map under the hood, which defaults to a cylindrical equidistant map projection unless mpProjection is set to something else. Plotting data in its native projection means that you MUST set the exact parameters of the native map projection or the plot will not be correct. 0). mpGridAndLimbDrawOrder is set to "PreDraw" so that the map grid lines are drawn before the map outlines and map fill. topo_9. lcmask_1. Important note : in NCL version 6. It shows how to use NCL to recreate an existing JPEG that contains a topographic map. ncl This script is based on the "newcolor_11. 3. ncl functions (graphics routines) NCL Home > Documentation > Functions > WRF, Graphics routines wrf_map. Changing the color of map outlines lcnative_latlon_1. mpSatelliteDistF=3. Just for something different, the data are plotted over an orthographic projection instead of a cylindrical equidistant map projection. NCL Home > Documentation > Graphics Overlaying data on a map For some specific examples of plotting data on a map, see the "Plotting data on a map using gsn_csm_xxx functions" examples page. Zooming in on a particular area on a Lambert Conformal map. If you have data that's on a particular map projection, you can easily project it onto a different map projection. The used data sets of the example scripts are stored on our supercomputer mistral in the directory /work/kv0653/NCL/data To plot WRF-ARW data with the gsn_csm scripts in the native map projection defined on the file, you must do three things: Call wrf_map_resources. The cnMaxLevelCount resource is set to 256 to force NCL to use more contour levels. ncl: This script is similar to native_1. Plotting data on a map is also referred to as overlaying data on a map. Sample of all the NCL map projections with contours overlaid. py# This script illustrates the following concepts: Outlining continents. 变量命名规则; 元数据; 评论; ncl列表. 列表变量创建; 列表 ce_3. For a cylindrical equidistant projection, one method to zoom in on a map area is by setting min/max lat/lon values:. mpProjection = "satellite", Selects the map projection. In order to plot a subregion, the map must be limited or "zoomed". The default is to show only the northern hemisphere, unless the special resource gsnPolar is set to "SH". The special "lat2d" and "lon2d" attributes are attached to the data, so the plotting routine knows what the lat/lon values are. polar_1. ncl : This example shows the effect that shapefile masking will have on both a coarse (32 x 64) and fine (64 x 128) grid. If the value is 1. Further, the mpLimitMode= "LatLon" is used to manually set the appropriate limits for each projection. To plot WRF-ARW data with the gsn_csm scripts in the native map projection defined on the file, you must do three things: Call wrf_map_resources. ncl : An example of a Mollweide projection. ncl: Unmasked and masked lambert conformal projection. 定义数组; 数组索引和切片; 常用数组操作; 评论; ncl变量. The data is still being plotted in the native WRF map projection, so you must call wrf_map_resources in order to set the correct map resources. ncl script plots the region of the lower 48 United States using two different map projections: Cylindrical Equidistant and Robinson. The data are on a Lambert Conformal projection. NCL also supports shapefiles, if you need to add map outlines that NCL doesn't have. In NCL versions 6. You can use this for rectangular map projections only. ncl: Shows how to draw the lat/lon grid lines with different spacings and with a dash pattern, using mpGridLineDashPattern, mpGridLatSpacingF, and mpGridLonSpacingF. 0 on this script. Set tfDoNDCOverlay = True By default, when data are placed onto a map, NCL performs a transformation to the specified projection. This page goes into more detail than what is covered below. Turning on map country boundaries. Example pages containing: tips | resources | functions/procedures Map Examples The following pages contain NCL scripts and graphics that you can download and use. The narr_4. No data transformation native_6. gsnPolar = "NH" gsn_csm_contour_map_polar is the plot interface that draws a contour plot over a polar stereographic map. gsnMaskLambertConformal = True will turn on the projection masking. A Python version of this projection is available here. 0 or less, the satellite projection is replaced by its limiting case: an orthographic projection. NCL 绘图示例（四）： 兰伯特投影图 施宁 （南京信息工程大学 大气科学学院） procedure add_lc_labels(wks,map,minlat,maxlat,minlon,maxlon,fontheight) wrf_zoom_2. Since the relationship between the map projection area and NDC coordinates changes whenever the map limits are changed, as well as when the viewport area is moved or resized, MapTransformation resets the value of mpBottomNDCF to the NDC value of the bottom edge of the projected area at the end of any update to the transformation. . Reads in data and then creates a default plot. See full list on annefou. For a valid list of map projections, see the projections associated with the mpProjection resource. shapefiles_16. 解释性语言; 动态类型语言; 强类型语言; ncl数据类型. github. ncl: This example plots the same data as the previous example, except this time gsn_csm_contour_map is used to plot the data. ncl, except it compares plotting the data using both native and non-native settings. 02 ; change size of main title ; res@pmTickMarkDisplayMode = "Always" ; tickmarks for some maps ;----- ; Loop through the map projections and draw The left image is from running NCL V6. ncl: This script shows how to plot a subregion of a map, and compares two kinds of map tickmark labels. 0, the mpDataBaseVersion resource was updated from having a default of "LowRes" to having a default value of "Dynamic". Here's the NCL script for generating See the description at the top of the Map outlines examples page for information about a change to the behavior of the mpDataBaseVersion resource in NCL V6. 0. mapgrid_2. Using all three Cartopy Lambert projections to find the best fit for visualization NCL_maponly_2. There are two main NCL functions for creating just maps: gsn_csm_map gsn_csm_map_polar. ncl" example, except it projects it onto the default cylindrical equidistant map projection. 数值类型; 非数值类型; 类型转换; 类型测试; 评论; ncl数组. mpProjection = "LambertConformal" turns on the correct projection. Most of the NCL examples, tipps and tricks have been collected from our NCL user requests. io NCL_lcnative_1. auljlc liyq kzgqb cued ahzsd iowtbl pdi jztur nwx fxuerx ocmg ftcsfnpe gkw lix uzjtdl