Photometric redshift is a classical technique to infer redshifts of objects using photometric data, but its importance has been rapidly increasing in recent years.  On-going/Up-coming large imaging surveys such as DES, Euclid, KiDS, HSC, LSST and WFIRST all rely heavily on photometric redshifts.  However, it is a big challenge to achieve the required photometric redshift accuracy for various science cases, especially weak-lensing cosmology.  It is a common challenge to all the surveys, and the Photo-z Workshop for Large Surveys 2017 offers an opportunity for people involved in photometric redshift efforts to get together, share problems, and join forces to address them together.

May 17 (Wed):   Joint session with HSC  (20min talk + 10min questions)

chair: Tanaka
13:30-14:00 overview and recent results from HSC (Takada)
14:00-14:30 overview and recent results from KiDS (Hildebrandt)
14:30-15:00 overview and recent results from DES (Hartley)
15:00-15:30 break
15:30-16:00 overview of Euclid (Kuijken)
16:00-16:30 overview of WFIRST (Capak)
16:30-17:00 overview of LSST (Schmidt)

Banquet

May 18 (Thu):  Photo-z workshop

chair: Paltani
on-going surveys: DES
09:00-09:20 Clustering redshift approach in Y1 (Miquel)
09:20-09:40 Y3 roadmap and joint WL, photo-z selection (Bernstein)
09:40-10:00 Limitations of spectroscopy (Hartley)
10:00-10:30 break
On-going surveys: KiDS
10:30-10:45 KiDS multi-colour photometry (Kuijken)
10:45-11:00 KiDS 4-band photo-z performance with different methods (Bilicki)
11:00-11:15 KiDS-450 and KiDS-VIKING (Hildebrandt)
11:15-11:30 KiDS photo-z estimation based on machine learning (Amaro)
11:30-13:00 lunch
On-going Surveys: HSC (each slot includes time for questions and discussions)
chair: Schmidt
13:00-13:20 Overview of HSC photo-z’s (Tanaka)
13:20-13:40 Loss/Risk functions, ‘best’ point estimates and a new NN code (Mineo)
13:40-14:00 Recent results from deep learning (Nakano)
14:00-15:00 photo-z calibration challenges (Hildebrandt/Capak)
15:00-15:30 break
15:30-17:00 group discussion

May 19 (Fri): Photo-z workshop

9:00-10:00 group discussion continued.
10:00-10:15 short break
chair: Coupon
10:15-11:00 report from each group (10+5min each)
11:00-12:00 upcoming surveys: WFIRST
12:00-13:00 lunch
Upcoming Surveys: Euclid
chair: Hildebrandt
13:00-13:15 Photo-Z Requirements and Baseline Pipeline (Paltani)
13:15-13:30 Prescription for Galactic extinction in Euclid (Galametz)
13:30-13:45 Application of clustering methods for the reconstruction of redshift distributions in MICE2 (Scottez)
13:45-14:00 The Complete Calibration of the Color-Redshift Relation (C3R2) Survey (Masters)
14:00-14:15 Training sample machine (Coupon)
Upcoming surveys: LSST
14:15-14:30 LSST photo-z overview (Schmidt)
14:30-14:45 Incompleteness models (Hartley)
14:45-15:00 Codes used in data challenge/Gpz (Jarvis)
15:00-15:15 Validating cross-correlation calibration on simulations (Morrison)
15:15-15:30 Photo-z PDF tests and storage (Malz)
15:30-16:00 break
16:00-17:00 discussion

The workshop will be held at the Tohoku University in Sendai, Japan.  The astronomy department is located on a hill, Aobayama, and is easily accessible from the Sendai city center by subway. The workshop will be held at the Aoba Hall, located on the ground floor of the Science Complex C in this map.   Detailed access information is here. If you have any questions, please feel free to ask Masayuki  (who used to live in Sendai).  Also, check out a very nice website about Sendai.

The participant list will be updated as we receive registrations.

Name	Affilliation	Survey Involved
Jean Coupon	University of Geneva	Euclid, HSC
Hendrik Hildebrandt	Arglander-Insitut für Astronomie, University of Bonn	Euclid, KiDS
Stéphane Paltani	University of Geneva	Euclid
Audrey Galametz	MPE	Euclid
Atsushi J. Nishizawa	Nagoya University	HSC
Daniel Masters	Infrared Processing and Analysis Center, Caltech	Euclid, WFIRST
Valeria Amaro	University of Naples Federico II	Euclid, KiDS
Maciej Bilicki	Leiden Observatory, Leiden University, the Netherlands	KiDS
Christopher Morrison	University of Washington	KiDS, LSST
Masayuki Tanaka	NAOJ	HSC
Daniel Stern	JPL/Caltech	Euclid
Will Hartley	UCL	Euclid, LSST, DES
Filipe Abdalla	UCL	DES
Massimo Brescia	INAF – Astronomical Observatory of Capodimonte	Euclid, KiDS
Stefano Cavuoti	University of Naples Federico II	Euclid, KiDS, LSST
Scottez	Institut d’Astrophysique de Paris	Euclid
Konrad Kuijken	Leiden Observatory	KiDS, Euclid
Gary Bernstein	University of Pennsylvania	DES
Sam Schmidt	UC Davis	LSST
Alex Malz	New York University	LSST
Ramon Miquel	IFAE Barcelona	DES, Euclid, LSST
Jun Nakano	Kanazawa Institute of Technology	HSC
Zahra Gomes	University of Oxford	Euclid, LSST
Peter Capak	Caltech	Euclid, HSC, WFIRST
Matt Jarvis	Oxford	Euclid, LSST
Bahram Mobasher	UC Riverside	Euclid
Francisco Castander	ICE, IEEC-CSIC	DES, Euclid, LSST, PAU
Masahiro Takada	Kavli IPMU	HSC
Masamune Oguri	Univ of Tokyo	HSC

The banquet on Wednesday will be in down-town Sendai.  Details will be announced later.  If you signed up for banquet, we will ask you to pay 5,000JPY(faculty members and post-docs) or 3,000JPY(students) at the registration desk.

Please book a hotel by yourself.  The SOC/LOC did not realize until recently that there is a local festival on the 20th and 21st (http://www.aoba-matsuri.com/ – Japanese page only).  It seems that there are not many available rooms left, especially over the weekend.  Please book early!  Here are a few suggestions from the LOC.
Metropolitan hotel
http://www.sendaimetropolitan.jp/

Hotel Monterey Sendai
http://www.hotelmonterey.co.jp/en/htl/sendai/

LibraryHotel Sendai Ekimae
http://www.libraryhotel.jp/sendaiekimae.html#top

Richmond Hotel Sendai Ekimae
http://sendai-ekimae.richmondhotel.jp/

Comfort Hotel Sendai Nishiguchi
https://www.choice-hotels.jp/sendai-w/

Peter Capak (Caltech), Jean Coupon (Geneva), Hendrik Hildebrandt (Bonn), Ben Hoyle (LMU), Sogo Mineo (NAOJ), Atsushi Nishizawa (Nagoya), Stephane Paltani (Geneva), Samuel Schmidt (UC Davis), Masayuki Tanaka (NAOJ)

This workshop is supposed by MEXT Grant-in-Aid for Scientific Research on Innovative Area, “Cosmic Acceleration”.