Other GIS Links
BIOGEOGRAPHIC INFORMATION & OBSERVATION SYSTEM
BIOS Tutorial: In-Stream Habitat
Analyzing In-Stream Habitat Reach Summary Data Parameters
In the BIOS Mapviewer:
- First, open the BIOS Data Catalog by clicking the "Add BIOS Layers" tool (1).
- Then, filter the list of Available Layers by selecting the "Layer Name" filter field (2) and entering the search term "stream habitat" in the Search Term box (3).
- Add the filter (4) and then check the "Stream Habitat Surveys - North Coast Reach Summaries" item (5) to add it to the "Checked Layers" box on the right.
- Then click the "Add Checked Layers to Map" button (6) to add this layer to the map.
Back in the map:
- Click the checkbox next to the added layer name to turn it on (7).
- Click on the layer name text to make it the "Active Layer".
- Finally, click the "Refresh Map" button to reflect your changes.
Next, choose a stream to examine:
- Using the "Zoom" tool (8) and anchoring with the mouse button, draw a zoom box about the size shown at (9).
- Then, using the "Identify" tool (10) , choose a stream by clicking on it (11), and observe the results in the results panel at the bottom of the map viewer (12).
Use the horizontal scroll bar (13) to locate the field named "PCT_DGE4". Clicking on a field name in the results panel (14) will open the field definition (metadata) for the field (15).
Next, create a compound query that will select records (stream reaches) with at least 30% of the reach (by length) in embeddedness class 3, and 20% of the reach (by length) in pool habitat units with depths > or equal to 4 feet.
- Open the "Attribute query" tool (16) and clear previous query parameters (if any, 17).
- Double-click the "PCT_EMBED3" item in the left query panel (18) followed by the ">" operator (19).
- Double-click the value "30" in the right query panel (20).
- Continue by clicking the "and" operator (22), double-clicking the "PCT_DGE4" parameter in the left query panel (21), the ">" operator, and the value "20" in the right panel.
- Execute the query (23) by clicking on the Execute button.
The query should yield 22 records scattered throughout the data set. To examine them:
- Click the "Zoom to selection" button (24) and note the clustering of the query results near southern Humboldt and northern Mendocino counties (25).
- The yellow box next to the layer name (26) indicates that the layer contains a selected record set.
- The record count (27) and results (28) are shown in the lower panel of the map window.