Modify Graudated Colors Map.

Instructions for use

The user can modify various Parameter Settings of the Graudated Colors Map in the "Graudated Colors Map" "window to realize the thematic map effect more in line with the requirements.

Operation steps

Select a certain Graudated Colors Map layer in the Layer Manager, right click the Modify Thematic Map "button, and the setting information of the selected Graudated Colors Map will be displayed in the pop-up thematic map properties window. Different types of Vector Layers have the same settings when making Graudated Colors Map. Take the attribute window of making Graudated Colors Map based on surface layer as an example:

  1. Thematic Map Layer: Displays the name of the currently rendered thematic map.
  2. Expression: The "Expression:" combo box is used to display and set the Thematic variable of the current Graudated Colors Map, that is, the mathematical expression of a Property Field or Property Field of the current layer.
    • Click the Drop-down Button of the "Expression:" combo box, and all the Property Fields used to make the Vector Dataset of the current Graudated Colors Map are listed in the pop-up drop-down list;
    • In the drop-down list, select the Thematic variable (single Property Field) of the current Graudated Colors Map layer; Users can also click the Expression.. "Item in the drop-down list to build the field expression in the pop-up SQL Expression" dialog box. Thematic variable as a Graudated Colors Map.
    • The current Graudated Colors Map will be re-graphed in real time according to the modified Thematic variable, and the Display Effects will be refreshed.

    Note For data Create Thematic Map of Oracle Plus and SQL Plus engine types, field expression can only be field value or field expression, such as (SmID) or (SmID + 1). The By Conditions expression is not currently supported to set the way the thematic map fields are set. If the set field expression is a conditional expression, such as "SmID > 100", the thematic map produced will fail, and the Output Window will prompt "Thematic map update failed".

  3. Segmentation method: The Drop-down Button to the right of the "Method:" item is used to display and set the segmentation method of the Thematic variable in the current Graudated Colors Map. The user clicks the drop-down list of the combo box to select the appropriate segmentation method.
    • Equal Interval: Based on the maximum and minimum values of all thematic values determined by the Thematic variable, the segments are divided at equal intervals according to the "number of segments" set by the user. In an Equidistant Interval, each segment has an equal length.
    • Square Root Interval: Equidistant interval is performed on the segmented data of the square root of the thematic value determined by the Thematic variable. Firstly, take the square root of all thematic values, and then carry out Equidistant Interval to obtain the segmentation points of the processed data, and then square the values of these segmentation points to obtain the segmentation points of the corresponding thematic values, so as to obtain the segmentation scheme of the thematic values.
    • Standard Deviation Interval: reflects the deviation of a certain attribute value of each object from its average value. First, calculate the mean and standard deviation of the thematic values determined by the Thematic variable, and then segment them. The length of each segment of the Standard Deviation Interval is One Standard Deviational, the middle segment is centered on the mean, and the left and right segment points are 0.5 standard deviations from the mean, respectively. The "number of segments" obtained by the Standard Deviation Interval method is determined by the Calculate Result and cannot be controlled by the user.
    • Logarithmic Interval: is basically the same as the Square Root Interval method, but the difference is that the Square Root method takes the square root of the thematic value, while the Logarithmic Interval method takes the logarithm of the thematic value. That is, an Equidistant Interval is performed on the base-10 logarithm of the thematic value. Firstly, perform Equidistant Interval on the logarithms of all thematic values to obtain the segmentation points of the processed data, and then take 10 as the base, and take the values of these segmentation points as the power of the exponent to obtain the values of each segmentation point of the corresponding thematic values, so as to obtain the segmentation scheme.
    • Quantile Interval: Each range segment has an equal number of Object Counts, which is determined by the user-specified Number of Segments and the actual Object Count in the layer used to make the Graudated Colors Map. Records should be the same in each segment when they can be divided equally, but when they cannot be divided equally, the segmentation results will be different in the last segment.
    • Custom Interval: The user specifies the length of each segment, that is, the "single segment length" for segmentation. The "number of segments" is calculated by the application system according to the specified interval distance and the maximum and minimum values of the thematic value, and cannot be controlled by the user.
    • Natural Interval: Automatic segmentation can be performed by the difference between data attribute values to maximize the difference between groups.
  4. Number of Segments: The "Number of Segments:" spin box is used to display and set the number of segments for the current Graudated Colors Map to segment the thematic value, that is, the number of range segments.
  5. Length of single segment: The "Interval:" digital display box is used to display and set the interval distance of the current Graudated Colors Map segment, that is, the length of each range segment. The setting of this item is only effective when the segment method is Custom Interval.
  6. Segment Rounding Precision: "Segment Rounding Precision": The Drop-down Button on the right side of the item is used to set the rounding precision of the segment value, and the program provides 15 kinds of rounding precisions. 10000000, 1000000, 100000, 10000, 1000, 100, 10, 1, 0.1, 0.001, 0.0001, 0.00001, 0.000001, 0.0000001, 0.00000001, respectively. For example, when the segment rounding precision is set to 0.1, the segment value is rounded to the last decimal place; when the segment rounding precision is set to 1000, the segment value is rounded to the first three decimal places.
  7. Segment Title Format: The Drop-down Button to the right of the "Label Format:" item is used to specify the format for expressing the range of values for each range segment. Two segment title formats are provided and can be selected through the Drop-down Button.
  8. Color Scheme: The "Color Scheme:" combo box is used to display and set the color style of each range segment in the current Graudated Colors Map.
    • Click the Drop-down Button on the right of the Color Scheme: combo box and select a Color Scheme from the drop-down list to assign different colors to each range segment of the Graudated Colors Map according to the selected color scheme.
  9. All range segments are listed in the lower part of the Merge or Split Range Segments: tab. You can merge and split each range segment as needed.
    • The Merge button is used to merge the selected multiple continuous range segments (the Ctrl or Shift key can be used together) into one range segment. The range range of the merged range segment is the union of the range ranges of all the merged range segments. If none or only one range segment is selected, or the selected range segments are not continuous, this button is unavailable.
    • The Split button is used to split a selected range segment into two new range segments.
  10. Visibility settings:
    • Click the Visible icon button in the toolbar to control the visibility of objects corresponding to all selected range segments in the range segment list.
    • Click the visible icon in each range segment item to control the visibility of the corresponding object of the range segment.
  11. Symbol Style Settings： The toolbar in the middle of the Graudated Colors Map "window can be used to set the display style of the selected range segment in the segmentation range segment list. The user can also click the Marker Style icon in each range segment item to display the Bounds Settings segment corresponding to the Map style in the pop-up resource list. The function of the Symbol Style Settings button is different for Graudated Colors Map created by different types of Vector Datasets.
  12. Sub-item positioning: Select one or more thematic map sub-items in the thematic map sub-item list, right click and select the "Positioning" option to display the corresponding objects in the Highlight in Map. If the anchored object is in the Current MapVisible Bounds:, the object is directly highlighted; if the anchored object is not in the current Map, the Map Scale? Center Display anchored object is maintained. Note: When using the sub-item positioning function of the thematic map, it is necessary to set the layer to a selectable state.
  13. Segment Value: The "Segment Value" column in the range segment list is used to display and set the value of the segment point (the end point of the segment) of each range segment (as shown in the figure above). Each spin box corresponds to a segment point, and the value of the segment point can be changed through the spin box. The changed results are reflected on the current Graudated Colors Map layer in real time.
  14. The Title column in the Title: range segment list is used to display and set the title of each range segment.
  15. The Parameter Settings in the Graudated Colors Map "window will be reflected to the corresponding thematic map layer in the current Map in real time, that is, WYSIWYG. You can also disable Enable Real-time Refresh by unchecking the Enable Instant Refresh "checkbox at the bottom of the dialog box. If the "Enable Instant Refresh" "check box is not checked, the user can click the" Apply "button at the bottom of the dialog box to apply the Parameter Settings in the dialog box to the current thematic map after completing the Parameter Settings.

Remark

  1. The Graudated Colors Map made and modified by the user can be saved as a template so as to be applied to the thematic map making of other layers. For details of Save as thematic map template, please refer to Save to Thematic Map Template Library .
  2. If the field selected in the expression is null, you can also set the relevant parameters such as the number of segments, range, and style of subitems, which are suitable for outputting as Thematic Map Template.
  3. When Create Thematic Map in the Use Template mode, the user can directly select the saved template in the drop-down menu of the Template Drop-down Button to apply it to the production of other thematic maps.