Use the basemap menu on the right side of the HydroGIS toolbar at the top to select a background map for the HydroGIS map window.
Click the layers button on the HydroGIS toolbar to turn the map layers panel on or off. In the map layers panel, individual layers are grouped by themes and the + symbol next to each theme can be clicked to expand layers within a group (click - to contract grouped layers). Expanded layers can be turned on or off individually by checking and unchecking the boxes next to the layers. Layers in the map layers panel that are turned on can be explored and/or downloaded in tabular form. Another feature of the map layers panel is the slide bar. The slide bar can be used to control the transparency of activated layers shown in the map window. Sliding the bar to the right decreases the transparency of activated layers and sliding it to the left increases transparency of activated layers.
The navigation tools can be accessed from the HydroGIS toolbar to easily view and explore features displayed in the HydroGIS map window. From left to right, the navigation tools allow users to zoom in, zoom out, zoom to full extent, pan left, pan right, and pan by clicking and dragging the map.
Zoom to Point
The zoom to point tool can be accessed from the HydroGIS toolbar and used to zoom to a specific geographic location and display it in the HydroGIS map by entering latitude and longitude coordinates in decimal degrees.
Zoom to a specific location by clicking the locate tool on the HydroGIS toolbar and entering an address on the menu.
Use the measure map tool on the HydroGIS toolbar to measure a polygon area, linear distance between two points, or to select a location on the map and return its geographic coordinates. To measure a polygon area, select the area button on the measurement panel and draw a polygon on the map. Measurement results are displayed in the window in the units (i.e. miles, kilometers, feet, meters, or yards) specified on the menu by the user. To measure the linear distance between two points, select the distance button on the measurement panel and click once at the beginning and double click at the end of the line to complete. Measurement results are displayed in a new window. The location button on the measurement panel provides the coordinates at the selected location in either decimal degrees or degrees/minutes/seconds.
By selecting the identify tool, users can view attributes of features within a specific target layer that is active on the map or for all visible layers on the map. Users can choose to view information for features by clicking a feature shown in the map window directly, or by drawing a polygon on the map to view attributes for features within the polygon. Users can also identify features by selecting a feature on the map with the identify tool and specifying a buffer distance using the find nearby features identify menu option. Nearby features can include features from any feature layer active on the map.
Use the search features tool on the HydroGIS toolbar to query data by entering keywords on the menu. Query results are displayed in the map window and attributes of selected features are shown at the bottom of the screen.
Use the clear graphics button on the HydroGIS toolbar to clear the current data selection.
Click on the 'i' icons next to any map layer in the Table of Contents to view descriptions of layers and attributes.