Phoenix PD Ruger P-95 LEA scans

Email [e-mail] to obtain the data.The data consist of scans of bullet land engraved areas in x3p format. The study is structured so that there are 8 barrels (identified with an alphanumeric code, such as A9, C8, etc.) used to fire the known bullets in the study, with three bullets known to be fired from each barrel (Bullet1, Bullet2, Bullet3). Each bullet contains 6 land engraved areas, which are identified as Land 1-Land 6. In addition to the 24 bullets with known provenance, there are 8 "unknown" bullets which can be matched to the 8 barrels, for a total of 32 bullets. Each bullet has 6 land engraved areas, for a total of 192 scans. Unknown bullets are identified with a letter.This study is an open study, that is, not all of the unknown bullets may match to the known barrels in the set. Some of the unknown bullets may have been fired from other types of Ruger handguns. The x3p format provides for the inclusion of relevant metadata within the x3p file, including the machine used to scan the bullets, the operator, and the resolution of the scan. The total dataset size is about 3.4 GB. Files are grouped as follows: BarrelXX/BulletY/ with the land number identified as part of the filename. Information on x3p format: https://www.iso.org/standard/62310.html We have produced two R packages meant to work with this data: - x3ptools (on CRAN, with dev versions on github at heike/x3ptools). x3ptools contains utilities for reading, writing, annotating, rendering, and exporting x3p data to other formats. - bulletxtrctr (dev version on github at heike/bulletxtrctr). bulletxtrctr contains utilities for extracting useful data from bullet LEA scans as well as a matching algorithm used to match unknown bullets to the barrels they were fired from. Scans were created by Bill Henderson at Sensofar. Tylor Klep of the Phoenix Police Department designed the study and collected the bullets.如需获取本数据集，请致邮[e-mail]。 本数据集包含以x3p格式存储的枪弹阳线刻痕区域（bullet land engraved areas）扫描数据。本研究共设置8根枪管，以字母数字组合代码（如A9、C8等）进行标识，每根枪管均发射过3枚已知来源枪弹（分别记为Bullet1、Bullet2、Bullet3）。每枚枪弹带有6处阳线刻痕区域，依次标记为Land1至Land6。 除上述24枚已知来源枪弹外，本研究还包含8枚可与8根枪管进行匹配的未知来源枪弹，总共计32枚枪弹。每枚枪弹对应6处刻痕区域扫描，总扫描量达192次。未知来源枪弹以单个字母进行标识。 本研究属于开放性研究，即并非所有未知来源枪弹均可与本研究中的已知枪管匹配，部分未知枪弹可能由其他型号的鲁格（Ruger）手枪发射。 x3p格式支持在文件内嵌入相关元数据，包括枪弹扫描所用设备、操作人员以及扫描分辨率等信息。数据集总容量约为3.4 GB。 文件分组规则如下：按BarrelXX/BulletY/的层级结构组织，文件名中包含对应的阳线刻痕区域编号。 x3p格式相关说明：https://www.iso.org/standard/62310.html 本团队开发了两款适配本数据集的R语言工具包： - x3ptools：已发布于CRAN，开发版本托管于GitHub仓库heike/x3ptools。该工具包提供读取、写入、标注、可视化以及将x3p数据导出至其他格式的实用功能。 - bulletxtrctr：开发版本托管于GitHub仓库heike/bulletxtrctr。该工具包可从枪弹阳线刻痕（LEA）扫描数据中提取有效信息，并提供用于将未知来源枪弹匹配至对应发射枪管的算法。 本数据集的扫描工作由Sensofar公司的Bill Henderson完成，研究设计与枪弹收集工作由菲尼克斯警察局的Tylor Klep负责。