LRO LEND Average LEND Counts Data Reduced Data Record (RDRALD)

RDRALD – Average LEND Counts Data Reduced Data Record

Instrument: Lunar Exploration Neutron Detector

PDS Data Set ID: LRO-L-LEND-4/5-V1.0

For more information about LEND RDR products, see the RDR Product SIS.

For more information about all LEND products, see the LEND Archive Volume SIS.

The Lunar Exploration Neutron Detector (LEND) Average LEND Counts Data Reduced Data Record (RDRALD) data products contain Neutron Detector science data that is processed by normalizing and averaging derived data to yield science data in a counts/second format for each Lunar map pixel.

Background subtracted, non-Solar Particle Event (SPE) influenced time series data are used to create temporally and spatially binned counting rate data for each of the five un-collimated LEND neutron signals and one for the four collimated sensors. The creating of spatially averaged counting rates requires the time series collection interval data to be distributed between the .5-degree x .5-degree latitude longitude map cells. The time series data distribution is accomplished by registering each collection interval to the projection of the spacecraft orbital trajectory on the surface of the Moon. The time series data distribution is accomplished by registering each collection interval to the projection of the spacecraft orbital trajectory on the surface of the Moon. The spacecraft trajectory projection during a single ~1 second collection interval is fit with a straight line. The projected straight line spacecraft trajectory is used to determine the fraction of the data collection interval that resides inside each .5x.5 degree map cell. The fractions of each collection interval within a given map cell are then used to calculate the total number of counts and collection time in each map cell.

The RDRALD data products are a collection of averaged, normalized neutron counting rates and errors for the neutron spectra collected by the 9 neutron detectors aboard the LEND instrument. The data products are structured as a single 23-column data file for each of the poles and for the equatorial region.

LEND RDRALD products have the following file names:

LEND_RDR_ALDt_yyyymmdd.DAT (with detached PDS label)

where:

t = product type

E = equirectangular

N = north polar

S = south polar

yyyymmdd = 8-digit date specifier

In ODE, RDRALD products have the following product IDs:

LEND_RDR_ALDT_YYYYMMDD_DAT