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CoCoRaHS Interactive Map Features
This application is intended to provide the interactivity missing in the static mapping system and has the capability to map over ten thousand data points at time.
Among the features available with this mapping system are:
Ability to produce accumulation maps for periods from two to 45 days
Display maps for Hail and Significant Weather Reports
Map all stations (active and inactive), or just active stations
Select map scale colors
Quickly go to a particular location on the map
Access the individual observations by clicking on the dot on the map
Copy and/or bookmark a particular map, set a default map view
Select either dynamic or static scaling for a map
Map options such as Units, Color, Key, and Overlays are saved so you don’t have to change them
each time you open a map. A description of these features and additional help on using the map are included in the following pages.
Additional features are being planned for future implementation. Please use the “Feedback” button at the top right hand corner of the map screen to submit any comments you may have about the map.
NOTE: The mapping system synchronizes with the CoCoRaHS database every two minutes during peak time in the morning, and every five minutes the rest of the day. Therefore, you may not see your observation immediately after you enter it depending where in the update cycle you submitted your data. You may use the Static map to see your data more quickly.
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Map Overview
Zoom Controls
Zoom in Zoom out Zoom to selected window Note: This turns off once win‐dow has been displayed (NEW)
You can also zoom using the scroll wheel on your mouse.
Quickly select a date to display a map. Default is the current day. Select Range to select a date range to display an accumula
on map. Use the
to advance or go back a day.
This displays the Map Op
ons window.
Home: CoCoRaHS home page
Help: Info about this map and link to fea‐tures document
Feedback: Submit comments or sug‐ges
ons
Select Base Map style
When you select Range, a calendar will appear with today’s date highlighted. Select your start date and end date. Use the naviga
on bu
ons on the calendar to select a different month or year
Click on map
tle to reload and zoom out to the default view.
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The legend window is reposi
onable to anywhere on map. Just click on the window and drag it to where you want it. The size of the window is fixed and cannot be changed.
Click on ^ to minimize the window (useful when viewing map on smart phones).
When the zoom level is high enough values will appear on the map. A por
on of a zoomed in map is shown below.
Map Overview
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Map Overview
Selecting a dot on the map will display the observation for that location, including comments, if any. Selecting the Details option will pull up the observation on the CoCoRaHS web site (same as using View Data).
When you select Sta
ons as the parameter to display in the Map Op
ons menu All Sta
ons will display the sta
ons as shown below. You can choose to display only ac
ve sta ons.
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When you select a sta
on by clicking on the dot, a Sta
on Overview and Precipita on Observa
on History will be displayed
Map Overview
When Sta ons is selected in Map Op
ons, sta
on numbers will be displayed when you zoom in on the map.
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The Map Options Window
There have been major updates to the Map Options window with the February 2021 update. The Map Options win‐dow is accessed by clicking on the button at the top right hand corner of the screen
This updates the map a er op
ons have been selected
Copies a link of the currently displayed map window to the clipboard
This will zoom the map to your current loca
on. This is based on the loca
on of the IP address detected. If you are using a dynamic IP address generated by your ISP then this may not work as in‐tended.
Type a loca
on in this box (e.g. “Denver, CO” ) and map will zoom to that loca
on when you click on GO. Zip code works best.
Select your country, then state/province/district, and if desired, county. Map will zoom a
er each selec on.
If Auto‐close is selected, the Map Op
ons window will close when the Update Map bu
on is clicked. If Keep open is selected, the Map Op
ons window will remain open on the screen un
l you close it.
Select this to set the current map view as the default. The next me you open the map it will open to this view. Click Reset to re‐
set the default to the standard view.
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Select what parameter you want displayed. Op
ons include:
Precipita on New Snow Depth
New Snow Water Content
Snow on Ground Depth
Snow on Ground Water Content
Significant Weather Hail All Sta ons Ac
ve Sta ons
The Map Options Window
The accumula
on query will only include mul
‐day observa
ons whose start and end dates are completely contained within the request date range.
For periods of longer than one day, only sta
ons with the selected percentage of data completeness will be displayed. 90 percent is the default.
NOTE: The “percent complete” filter rounds to the nearest whole day. For example, 0.90 x 7 days = 6.3 days, which is rounded to 6 days.
Select the
me period over which you want precipita
on. Daily is the default. If you select Custom, you will able to enter the start date and end date of the period over which the precipita
on will be accumulat‐ed. The
me window can be adjusted by dragging
either side of the slider. This is valid un
l changed and only for the current session. It is not saved.
Move backward and forward through dates by using this naviga
on bu on
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The Map Options Window
Select either U.S. or metric units
Select a color scale for the map
By default NA values are NOT displayed. Check this box to display them
Select the overlays you want to see on the map
Select type of map key to display in the leg‐end window. See explana
on below.
Dynamic or Sta c Key?
A dynamic key is one that scales to the data on the map. For example, if the range of precipita
on is from zero to 7.25 inches, the intervals in the map key will scale be‐tween those two values. This op
ons is what was used for the original CoCoRaHS “dot” maps. This op
on provides more resolu
on between amounts on the map.
The choice of a sta
c key fixes the range of the map legend to nine intervals from NA to 40 inches. This is useful if you wish to visually compare maps keeping the color scale the same on all maps. The disadvantage is that the scale is fixed no ma
er the range of precipita
on on the map, and in the highest category (4.00‐40.00 inches) all values will be the same color on the map.
Map Scale Colors
You have a choice of nine color pale
es for the map scale, in‐cluding the pale
e that is used for the original dot maps (CoCoClassic).
For mul ‐day accumula
on maps, we rec‐ommend the Yellow Green Blue pale
e.
The ‘Current Zoom’ level is now interac
ve and dynamic through‐out all zoom op
ons (mouse, +/‐ bu
ons, or the slider bar in the Map Op
ons.
The “Label Display Level” allows users to dynamically set the zoom level at which the data labels will be displayed.
CoCoRaHS Interactive Map Features
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