Abstract: Efficiency of operation related to acquisition of a tilt offset of a surveying apparatus is improved. A total station includes a tilt sensor, a tilt offset acquisition unit that acquires a tilt offset of the tilt sensor, a measurement unit that measures a variable value of a phenomenon that can cause the tilt offset to vary, and a determination unit that determines whether to acquire the tilt offset, based on output from the measurement unit.

Abstract: A heat shrinkable polyolefin laminate film having surface layers made of a crystalline polypropylene resin, and an intermediate layer made of an ethylene resin composition consisting essentially of a linear low density polyethylene and a syndiotactic polypropylene, which is stretched at least two times in the machine and transverse directions, respectively, and which does not cause lowering of the transparency even if recovered films are incorporated into the intermediate layer, is excellent in low temperature shrinkability and packaging machine applicability, and is suitably used as a heat shrinkable packaging material.

Abstract: The heat shrinkable polypropylene film having an isotactic polypropylene layer as surface layers and a layer mainly composed of a syndiotactic polypropylene as an intermediate layer, having a shrinkage of not less than 25% at 100.degree. C. in the machine and transverse directions and being stretched at least two times in the machine and transverse directions, respectively. The film has a good packaging machine applicability and excellent propagation tear resistance, low temperature shrinkability and heat resistance, and is suitably used as a shrink packaging material.