GridBGC

1
Grid-BGC Existing Components

• WWW interface to 18 years of daily surface
  weather data over the conterminous U.S. on a 1 km
  grid (Daymet).
• Visual C interface to the Biome-BGC model,
  linking remote surface weather database (Daymet)
  to local input/output database (Access, using
  ODBC).

2
Existing Daymet Interface
3
Daymet website (www.daymet.org)
4
Daymet website Data Access page
5
Data Access Climatological Summary Map Selection
6
Summary Map Variable Selection Temperature
pull-down menu
7
Summary Map Variable Selection Precipitation
pull-down menu
8
Summary Map Variable Selection Radiation
pull-down menu
9
Summary Map Variable Selection Humidity
pull-down menu
10
Summary Map Temporal Selection Annual (period
of record) pull-down menu
11
Summary Map Temporal Selection Monthly (period
of record) pull-down menu
12
Summary Map Temporal Selection Monthly (period
of record) pull-down menu
13
Summary Map Temporal Selection Annual (single
year) pull-down menu
14
Summary Map Browse Image
15
Summary Map Download Options

• Provides multiple download options
• Floating point binary data, for analysis
  applications (also a detailed Users Guide for
  these data).
• Plotter-sized pdf, for making a nice poster.
• Letter-sized jpg, for inclusion in other
  documents.

16
Summary Map Download PDF and JPEG
High-resolution subsets from example download
file (18-Year Mean of Daily Total Shortwave
Radiation)
Pacific Northwest
Mid-Atlantic states
Colorado Rockies
17
Summary Map Download PDF
Full-resolution subset illustrating 1 km
pixellation
18
Summary Map Download letter-size JPEG
All maps also include accurate color-scale and
length-scale information
19
Daymet website Data Access page
20
Data Access Single-Point Daily Data
21
Data Access Single-Point Data Download
Submit starts a cgi-bin call to the Daymet
webserver, passing the requested coordinates and
returning a formatted text file with all of the
daily data for the nearest 1 km Daymet gridcell
user then specifies a file name to save
downloaded file to local disk.
22
Data Access Single-Point Data Download
These daily data are formatted for direct input
to the Biome-BGC model, and are also in a
convenient form for input to other analysis
packages
23
Single-Point Data Example Analysis
24
Existing Biome-BGC Interface
25
BGC Interface Information and Data Transfers
User controls process through Visual C front-end
Interface sends SQL calls to Input/Output
database requesting particular site and PFT
records, creates new output records, and updates
database. Both interface and database can create
new site and PFT records.
Interface sends cgi-bin calls to Daymet server
requesting daily weather data file for a specific
geographic location. Server queries Daymet
database and returns formatted weather record.
26
BGC Interface Access Input/Output Database
27
BGC Interface Database Connection through ODBC
On execution of the BGC Interface, the user is
prompted to select a registered data source as
the Input/Output database. This opens a two-way
communication between the database and the
interface, allowing dynamic record updates.
This mechanism requires that the Input/Output
database be registered through the ODBC Data
Sources administrative tool after database
creation and before running the BGC Interface.
28
BGC Interface Design
29
BGC Interface Primary Components
Controls Simulation configuration and database
navigation
Site view linked to a database table of sites
storing geographic location (x,y,z), and soil
properties
PFT view linked to a database table of plant
functional types, storing plant traits
Output view linked to a database table of
summarized model output, and keyed to the Site
and PFT tables.
30
BGC Interface Model Configuration
31
BGC Interface Toolbar Functions
Model configuration file options New, Open, Save.
Database record options Add, Requery, Delete
Start simulation
Database navigation options First, Back,
Forward, Last.
Show / Set active database view Site, PFT, Output
32
BGC Database Views Site Table
Record Key Site ID
33
BGC Database Views PFT Table
Record Key PFT name
34
BGC Database Views Output Table
Record Keys Site ID, PFT name
Summarized output from steady-state simulation
Spinup simulation summary
35
Storyboard design for Grid-BGC interface
36
Grid-BGC Storyboard 1
Option to create new or use existing
configuration file
Begin editing configuration
User login
Define geographic region and buffer
Bounding coordinates or import GIS boundary files
Displayed through map interface (Arc-IMS?)
Select grid-style or list-style spatial domain
Select temporal extent and spatial resolution
Define surface weather input data
Use existing weather records and/or import a new
data source
37
Grid-BGC Storyboard 2
BGC model configuration
Define/select sites and PFTs
Define simulation parameters
Grid-compute configuration
Define/select Grid resources
Define resource parameters
Monitor model execution and data transfer
Execute Daymet and BGC models
Post-processing and analysis configuration
Visualization configuration