bkr_slope.py

The tool calculates cumulative elevation gains along a link in every 30 feet. Slope is then calculated from the cumulative elevation gain. It would reflect a bicylist's real climbing experience.

For some unknown reason, this tool would crash when executing ExtractValuesToPoints. Before it is fixed, we split the code and make it two scripts. So after the crash, run bkr_slope_step2.py to finish calculation.

More detailed description about the slope calculation can be found here and here.

Prepare Inputs

ArcMap and spatial analysis license are required for this tool. User needs to create a file geodatabase to keep transportation network. The transportation network is link feature class exported from EMME databank. In addition, USGS topology raster data is also needed.

Make sure the link feature class has an attribute F_biketype.

Input variables

Variables	Description	Sample Value
geodb	file geodatabase path	V:\TransDeptGIS\GeoDB\Planning\Modeling\BKRCast_BikeNetwork.gdb
in_fc	elevation raster file path	V:\ExternalData\UWGeology\GeoMapNWFeb2010\usgs_dem_30ft
output_dir	output directory for final results

Outputs

File Name	Description
emme_attr.in	an EMME transaction file that is used as an input file to the bike model
emme_attr.csv	same file as emme_attr.in but is friendly with ArcMap.
link_component	points split from links
link_component_full	points with all associated link attributes
link_component_elevation	point with elevation
ij_df.csv	directional links
ji_df.csv	directional links

directional links

Attribute	Description
ID	link ID
LENGTH	link length
MODES	link modes
INODE	link i-node
JNODE	link j-node
F_biketype	bike facility type