This study examines the external factors involved in the early reconstruction of the Yuriage Wharf Morning Market (YWMM) and the measures taken by the union to respond to these external factors. The purpose of this study is to identify effective knowledge for business recovery through early reconstruction.

 In Chapter 3, we identify the measures taken by the union in response to external factors. This study compares similar coastal commercial facilities after the Great East Japan Earthquake in terms of external factors such as Reconstruction period, Location, and Construction funds. "Reconstruction period" was categorized by confirming public works and evacuation measures until the facilities opened. "Location" compared ground level, relationship to the disaster risk zone, and distance to the town hall and the sea. The "Construction funds" reviewed the construction costs and history of donations.

 In Chapter 4, in order to clarify the tsunami evacuation situation in the morning market, the internal factor of the union's evacuation measures is organized. It then considers the external factors related to location: users and evacuation space. In order to determine the attributes of the users and their evacuation attitudes, a survey was conducted in YWMM. And in order to identify the evacuation spaces in the morning market, the location and outline of each evacuation space was compiled through administrative documents and field surveys.

 

 Summarize the findings from the union's measures for external factors related to early reconstruction that are useful for business recovery.

 1. Consideration of preliminary reconstruction plans and prediction of the reconstruction period.

 After the early reconstruction, the number of tourists immediately reached the same level as before the disaster, and the early reconstruction is considered to be effective for the reconstruction of the business.

 2. Evacuation measures and designation of evacuation space in response to the location.

 If there is a risk by prioritizing rebuilding in the original location, it is difficult to secure a sustainable evacuation space if the damage is significant, but flexible use of existing space to secure an evacuation space may be effective for project reconstruction.

 3. Creating Opportunities to Engage Supporters.

 In addition to the existing uses that supporters are interested in, the creation of places that will contribute to society, such as relaxation areas and disaster prevention centers, will be effective in attracting supporters to the project and its recovery.

 

 This case exists in a risky location, but with the consensus of the business, the government and the users, it was the earliest commercial facility to be rebuilt in its original location before the disaster. This project was on the same level as the one before the disaster, and it was also an attempt to create a place to contribute to society, and it can be said that it was a project that led the way to the reconstruction of the region as well as the reconstruction of the morning market.

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1 はじめに
東日本大震災の復興過程のアーカイブについては，NHKの「東日本大震災アーカイブス」の中での復興の軌跡や（独）防災科学技術研究所を事務局とする「東日本大震災・災害復興まるごとデジタルアーカイブス」（略称：311まるごとアーカイブス）をはじめとして，様々な取組がなされてきた．それらの中でも，Google社の日本法人が行っている「未来へのキオク プロジェクト」では，写真や動画の投稿プラットフォームとして既に6万1千件以上のデータがアーカイブされているだけでなく，ストリートビューという360度画像の閲覧サービスのデータを震災直後と震災後2年の2時点で取得し公開している(一部地域については震災前のデータ有)．360度画像は，人の目線に近い視点から空間全体を記録しているので，臨場感があるだけでなく，町並みや景観の記録としての価値も高く，このデータを元に建物の3次元モデルを作成し町並みを復元する試みもなされている．
本研究では，このように利用価値の高い360度画像を取得できるMMSを用いて独自にデータ取得を行い，復興過程のアーカイブを試みる．その際，写真測量技術により複数の360度画像から画像内の地物の位置や高さなどを計測する機能の有効性についての検討を行う．

2 研究手法
MMSによるデータ取得は，(株)トプコン製のIP-S2 Liteを用いた．このシステムでは，車両のキャリア上に6つのカメラ，GPS，IMUを備えたメインユニットを搭載し，車内に接続されたPCで動画撮影の制御とデータの保存を行う．このMMSはレーザースキャナを搭載していないが，撮影データの後処理により，動画内の地物の位置や高さを測定することができる．
対象地域は，被災地で最も早く防災集団移転事業が進んでいる宮城県岩沼市とした．
現地調査は，2012年8月4日～7日と2013年11月18日～19日に行い，津波の被害を受けた岩沼市沿岸部（の東側）をMMSにより撮影した．
 
3 結果
2012年と2013年のデータを比較すると，以下の変化を見ることができた．(1)防災集団移転地において造成工事が本格化し，用水路の整備や地面のかさ上げ等が開始された．(2)「震災遺構」にもなり得た相の釜地区の水防倉庫が解体された．（3）「千年希望の丘」の造成工事が開始された．(4)海岸部にあった瓦礫等が撤去され，防潮堤の工事が本格化した．また，画像内の計測機能については，特徴点が抽出できるところでは概ね1m以内の精度で測定できることが分かった．
今後は，現地調査を継続的に行うとともに，変化の大きい場所について，位置や高さの測定など定量的な解析を行う予定である．

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The purpose of this paper is to overview agriculture reconstruction process from the time before disaster up to the present, and clarify the factors which affect farmers' decision in that process. The factors which affected the establishment of production organization are 1) to recognize the necessity of production organization before the disaster, 2) to occur many farm retirements as the cause of the serious damage, and 3) to offer 'the leasing project' of the reconstruction grants, which set to target farmers' group. It affected the activity of production organization that the schedule of the construction work became tight due to the deadline of the reconstruction grants.

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