SLM Visualization

Overview

When you press SLM visualization, this interface will show up. The navigation menu enables to navigate and browse through the Raster database based on the theme/sub-theme structure. 

Figure1: Overview of the "SLM visualization" part

Once the query is done, the output results will be shown up on the interface. Eventually, the interface will be divided into 4 sections:

• Section 1: You can see the Filter options – Drill-down by Gaul (Country, Region, Continent, & District).
• Section 2: There are some controls – tools allowing you to move around the map with the use of zoom in, zoom extent, zoom out, pan functions etc.
• Section 3: You can see the output result for Value by Location, Summary Statistics, and Options by Context.
• Section 4:  You can see the report download.

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Figure2: Overview of the output of the SLM query

Section 1: Select By (GAUL)

Select by Region of Interest – Drill-down GAUL (Continent, Region, Country, Disctrict, Province).

Section 2: Map Toolbars

 Map navigation

1. Zoom In
2. Zoom Extent
3. Zoom Out

 Select by Region of Interest (Map)

1. Select by Polygon
2. Select by Window
3. Select by Location

 SLM

1. Show/Hide SLM

 Others

1. Filter
2. Show Options by Context

 Section 3: Output Window – Value by Location, Summary Statistics, Options by Context

1. Value by Location

 This table displays the values for each pixel. 

1. Summary Statistics

This table displays aggregated information related to the user defined area of interest.

1. Percentage of Pixel by Class

 This table displays the options ranked by frequency.

 Section 4:  Report Download

 The statistics for the ROI and the selected rasters for the ROI are available for download by clicking the download icon.

 2.3.6  Using the WebGIS Application

The Options-by-Context WebGIS application is designed for managers, scientists and staff in projects and programs and it extends MEL capabilities by using spatially explicit data and information. It provides the end users with a powerful suite of Web-based GIS analytical, mapping and reporting capabilities as well as performs large calculates and aggregations of data effectively and efficiently. It allows application users to identify resources, partnerships and perform geographic targeting. The system consists of several modules, each module completing a specific task.

The WebGIS is based on the conceptual framework of the Options-by-Context and provides a number of tools and functionality to the end users to conduct analysis, display maps, extract and filter data, report on the most relevant options by contextual for user defined area of interest, download data and metadata and display SLM practices. The database is designed in three main parts including context: Multi-dimensional Drivers, Land System Properties, outcomes and impacts: natural resources restoration, sustainable intensification and climate-smart practices, livelihood development and provides through interaction with MEL the options portfolio: technical options, land, water, breeds, design and institutional options.

The WebGIS is design to facilitate the user interaction and query efficiently. There is a number of tools such as drill-down selection through the administrative units layer, selection of the main themes (Options and Outcomes/Impacts) through the cascading selection functionality, selection of sub-themes which allows the end user to select the layers of interest, or select all layers or clear selection. This wizard based use case enables the user to ask a number of questions such as select the sub-themes on the administrative unit level of interest interactively. Within few clicks, the user narrows the area of interest for the indicators needed in his query focuses from global to national, sub-national level.

A number of tools such as user defined polygon, box or point are available to the user to narrow down his selection even further enabling the user to focus exactly to the area of interest other than administrative units level. The user can benefit from very high-resolution baseline imagery on the background to focus on local level. This functionality provides unprecedented flexibility on managing, analysing, mapping, aggregation and reporting on any user defined area. The user can apply further filters to run queries such as select areas where precipitation is more than [value a] and slope from [value b] to [value c] and extract the newly created raster layer by running queries online without the need of having access to GIS software for desktop.

The value by location table provides the pixel value and pixel units for every single pixel for all user selected raster layers making it a truly interactive tool for analysis. In addition, the summary table provides aggregated values and statistical information for the user defined area of interest. The Options by Context table provides the most suitable options ranked by frequency for each user-defined area when user presses the Similarity button. The user asks the system to find all the options for each user-defined region of interest that have similar practices under similar context. This is one of the most powerful functions of the WebGIS and unique in its nature as the user practically gets the options applicable to the selected location based on SLM practices at global level. This function makes the best use of global SLM practices and reports them at local level. The radar diagram shows the distribution of such practices and adds for insight to the data.

The user can download the selected layers and tabular information to use for own purposes.

The step-by-step guideline below provides details and instructions on how to use the application:

Step 1:  Administrative Unit Selection

Select a Region of Interest by navigating the Administrative Unit menu tree.  You can select by Country, Region, District, and Province.  In this example, “Amhara” is selected.

Step 2:  Theme Selection

Select a Theme by simply clicking on the Themes selection box.   For this example, “Context” is selected.

Step 3:  Sub-Theme Selection

 Once the theme is selected, the corresponding sub-themes are available from the selection list.   In this example, “Drivers” is selected.

 Step 4:  Dataset Selection

Once the Sub-Theme is selected, the corresponding datasets are available from the checkbox selection list.  User’s can select combination of datasets from different Themes and Sub-Themes.

In this example, “ARIDITY” and “PRECIP-TREND” are selected.

Step 4:  Apply Filter Selection

Click the Apply button to execute the filter.  Clicking the Reset button will clear your selections.

Step 5:  Filter Result

After applying the filter, the Map gets updated for the Region of Interest.

The results are displayed in the Summary Statistics table.

The selection by ROI buttons (Polygon, Window, and Location), Filter, and Option by Context are now enabled.  User can drill down further by using these tools.

Step 6:  Select ROI (Polygon, Window, Location)

In this example, Select Polygon is use to drilldown into Region of Interest.

Select the Polygon in the Map Toolbars.  Then, select a point of interest to start drawing the polygon.

Draw the polygon and close the first point to close the shape.

Once the polygon is drawn, the Map will zoom-in to the new ROI.

and Summary Statistics gets updated with the new ROI.

Step 7:  Show Options By Context

Click the button “Options by Context” in the Map toolbars.  This displays the options ranked by frequency.

Step 8:  Show Filter

To filter the selected Rasters by range value.   Click the button “Show Filter” in the Map toolbars this will show you the Filter dialog window.

By default, the selected layers are disabled.  Clicking the OFF button will enable the slider.

Drag the slider to change the value.

In this example, the selected layers are set to the following range:

kg3_8110:  min = 6; max = 11

agric_pop_ind:  min = 15; max = 50

Click “Run Query” to execute the filter.

The Map gets updated by applying a dynamic SLD based on the range value.

The Summary Statistics gets updated with a new range value.

Step 9:  Report Download

The results of the analysis can be downloaded by clicking the icon download.   It is located on the right hand corner of the Map Interface.

The downloaded files are package in zip file.

2.3.7 Validation of user inputs

The WebGIS is an interactive data-driven application by design. The process driven wizards, drill-down menus, option box selection and constrained filter section options, guides the user input. The user input is validated and the user-selected variables are passed to the spatial queries to obtain the results of the analysis. The user interface by design minimizes user entry errors by showing only the available rasters for each sub-theme, setting minimum and maximum values and ensuring that the user has made the relevant selection of options prior to activating the relevant buttons. The outputs of the any user query are hereby limited by the quality of the data and will fully reflect user inputs at all times.